ugly [ˈʌɡlɪ]
形容词[a.]: 丑陋的;难看的
例句1, The old, abandoned house on the corner of the street was so ugly that no one wanted to buy it.
街角那座破旧的废弃房子非常丑陋,以至于没人想买它。
例句2, She thought the painting was ugly, but her friend found it strangely beautiful.
她觉得那幅画很难看,但她的朋友却觉得它有种奇特的美。
例句3, His behavior at the party was truly ugly, leaving everyone shocked and disappointed.
他在派对上的行为非常丑陋,让所有人都感到震惊和失望。

U.K./ UK(缩) = United Kingdom [juː ˈkeɪ]
名词[n.]:英国, 联合王国
例句1, The United Kingdom is known for its rich history and cultural heritage.
英国以其丰富的历史和文化遗产而闻名。
例句2, She moved to the UK to pursue her studies at a prestigious university.
她搬到英国,在一所著名大学继续她的学业。
例句3, The UK has a diverse population with people from all over the world.
英国有着来自世界各地的人口,非常多元化。
例句4, Visiting the UK during the summer is a great way to experience its beautiful landscapes.
在夏季访问英国是体验其美丽风景的好方法。
例句5, The UK is a member of the United Nations and plays a significant role in global affairs.
英国是联合国成员国,在全球事务中扮演着重要角色。

umbrella [ʌmˈbrelə]
名词[n.]: 雨伞
例句1, She opened her colorful umbrella as the rain began to pour.
当雨开始倾盆而下时,她打开了她的彩色雨伞。
例句2, The company operates under the umbrella of a larger corporation.
这家公司在一个更大企业的保护伞下运营。
例句3, He used an umbrella term to describe the various genres of music.
他用一个总括性术语来描述各种音乐流派。

UN(缩) = the United Nations [juː ˈən]
名词[n.]: 联合国
例句1, The United Nations plays a crucial role in maintaining global peace and security.
联合国在维护全球和平与安全方面发挥着至关重要的作用。
例句2, Many countries collaborate under the United Nations to address climate change.
许多国家在联合国的框架下合作应对气候变化。
例句3, The United Nations has issued a statement condemning the recent acts of violence.
联合国发表声明谴责最近的暴力行为。
例句4, She aspires to work for the United Nations to contribute to international development.
她渴望为联合国工作,为国际发展做出贡献。
例句5, The United Nations’ headquarters is located in New York City.
联合国总部位于纽约市。

unable [juː ˈən]
形容词[a.]:不能的, 不能胜任的
例句1, She was unable to attend the meeting due to a sudden illness.
她因突然生病无法参加会议。
例句2, The team was unable to complete the project on time because of technical difficulties.
由于技术困难,团队无法按时完成项目。
例句3, He felt unable to express his true feelings in front of the crowd.
他感到无法在众人面前表达自己的真实感受。

unbelievable [ʌnbɪˈliːvəb(ə)l]
形容词[a.]:难以置信的
例句1, The magician’s trick was so unbelievable that the audience gasped in amazement.
魔术师的把戏如此难以置信,观众们都惊讶得倒吸一口冷气。
例句2, It’s unbelievable how quickly technology has advanced in the past decade.
过去十年科技发展的速度真是令人难以置信。
例句3, Her story about meeting a celebrity on the street was completely unbelievable.
她关于在街上遇到名人的故事完全不可信。

uncertain [ˈsɜːt(ə)n]
形容词[a.]:不确定的
例句1, The outcome of the experiment remains uncertain, leaving the scientists in suspense.
实验的结果仍然不确定,让科学家们悬而未决。
例句2, She felt uncertain about her decision to move to a new city, wondering if it was the right choice.
她对搬去新城市的决定感到不确定,怀疑这是否是正确的选择。
例句3, The weather forecast is uncertain, so it’s best to bring an umbrella just in case.
天气预报不确定,所以最好带把伞以防万一。

uncle [ˈʌŋk(ə)l]
名词[n.]: 叔,伯,舅,姑夫,姨父
例句1, My uncle taught me how to fish when I was a child.
我小时候,叔叔教我如何钓鱼。
例句2, Every summer, we visit our uncle who lives in the countryside.
每年夏天,我们都会去拜访住在乡下的舅舅。
例句3, My uncle always brings the best gifts for my birthday.
我的姑父总是给我带来最好的生日礼物。
例句4, I asked my uncle for advice on choosing a college major.
我向我的姨父请教了选择大学专业的建议。

uncomfortable [ʌnˈkʌmftəb(ə)l]
形容词[a.]: 令人不舒服的
例句1, The silence in the room was so uncomfortable that no one dared to speak.
房间里的沉默令人如此不安,以至于没有人敢开口说话。
例句2, She felt uncomfortable wearing the tight dress to the formal event.
她穿着紧身裙参加正式活动感到很不自在。
例句3, The chair was uncomfortable, making it hard for him to focus on his work.
那把椅子很不舒服,让他很难集中精力工作。
例句4, He found the conversation about politics to be quite uncomfortable.
他觉得关于政治的对话相当令人不适。
例句5, The heat in the room was so uncomfortable that everyone started fanning themselves.
房间里的热度令人非常不适,以至于每个人都开始扇风。

unconditional [ʌnkənˈdɪʃən(ə)l]
形容词[a.]:无条件, 绝对的
例句1, Her love for him was unconditional, never wavering even in the toughest times.
她对他的爱是无条件的,即使在最艰难的时刻也从未动摇。
例句2, The soldier received unconditional support from his family throughout his military career.
这位士兵在他的军旅生涯中得到了家人无条件的支持。
例句3, The treaty required the unconditional surrender of the opposing forces.
该条约要求敌对势力无条件投降。
例句4, He gave his unconditional promise to always stand by her side.
他无条件地承诺永远站在她身边。

unconscious [ʌnˈkɔnʃəs]
形容词[a.]:昏迷,不省人事的
例句1, After the accident, he lay unconscious on the ground for several minutes.
事故发生后,他在地上昏迷了几分钟。
例句2, The patient remained unconscious despite the doctor’s efforts to revive him.
尽管医生努力抢救,病人仍然不省人事。

under [ˈʌndə]
副词[ad.]: 介词[prep.]:在…下面, 向…下面
例句1, The cat is hiding under the table.
猫正躲在桌子下面。
例句2, She placed the letter under the pillow.
她把信放在了枕头下面。
例句3, The submarine traveled under the ocean.
潜艇在海洋下航行。
例句4, He works under a great leader.
他在一位伟大的领导者手下工作。
例句5, The temperature dropped under freezing last night.
昨晚温度降到了冰点以下。

underground [ʌndəˈɡraʊnd]
形容词[a.]:地下的; 名词[n.]: 地铁
例句1, The underground tunnels were used by the resistance during the war.
战争期间,抵抗组织利用了这些地下隧道。
例句2, She takes the underground to work every morning to avoid traffic.
她每天早上乘地铁上班,以避开交通拥堵。

underline [ʌndəˈlaɪn]
动词[v.]: 在…下划线
例句1, Please underline the key points in the text for better understanding.
请在文本中划出关键点以便更好地理解。
例句2, The teacher asked the students to underline the important dates in their history books.
老师让学生们在历史书中划出重要的日期。
例句3, She used a red pen to underline the mistakes in her essay.
她用红笔在文章中划出了错误。
例句4, The speaker’s words seemed to underline the importance of teamwork.
演讲者的话似乎强调了团队合作的重要性。
例句5, The report will underline the need for immediate action on climate change.
报告将强调对气候变化采取立即行动的必要性。

understand (understood, understood) [ʌndəˈstænd]
动词[v.]: 懂得;明白;理解
例句1, I finally understood the complex math problem after hours of studying.
经过数小时的学习,我终于理解了这道复杂的数学题。
例句2, She understood the importance of time management in her daily life.
她明白了时间管理在日常生活中的重要性。
例句3, The teacher explained the concept until every student understood it clearly.
老师解释这个概念,直到每个学生都清楚地理解为止。
例句4, He understood her silence as a sign of agreement.
他把她的沉默理解为同意的表示。
例句5, Understanding different cultures can enhance global communication.
理解不同的文化可以促进全球交流。

understanding [ʌndəˈstændɪŋ]
名词[n.]: 领会;理解
例句1, Her understanding of the complex theory was truly impressive.
她对这一复杂理论的理解确实令人印象深刻。
例句2, Mutual understanding is essential for a healthy relationship.
相互理解对于健康的关系至关重要。
例句3, He showed great understanding when dealing with the difficult situation.
他在处理这一困难局面时表现出极大的理解。

undertake (undertook, undertaken) [ʌndəˈteɪk]
动词[v.]: 承担, 从事, 负责
例句1, She undertook the responsibility of organizing the entire event.
她承担了组织整个活动的责任。
例句2, He undertook a challenging project to prove his capabilities.
他接手了一个具有挑战性的项目来证明自己的能力。
例句3, The company undertook to deliver the goods within a week.
公司承诺在一周内交付货物。
例句4, They undertook a journey across the desert despite the risks.
尽管有风险,他们还是踏上了穿越沙漠的旅程。
例句5, The government undertook measures to improve public health.
政府采取了措施来改善公共卫生。

unemployment [ʌnɪmˈplɔɪmənt]
名词[n.]:失业,失业状态
例句1, The government is implementing new policies to reduce unemployment and boost the economy.
政府正在实施新政策以减少失业并提振经济。
例句2, Unemployment can lead to financial stress and mental health issues for many individuals.
失业可能会导致许多人的财务压力和精神健康问题。
例句3, The unemployment rate has significantly dropped since the introduction of the job training programs.
自从引入职业培训计划以来,失业率显著下降。
例句4, She has been struggling with unemployment for over six months and is actively seeking new opportunities.
她已经失业超过六个月,正在积极寻找新的机会。
例句5, The company’s sudden closure left hundreds of employees facing unemployment.
公司的突然关闭导致数百名员工面临失业。

unfair [ʌnˈfeə]
形容词[a.]: 不公平的, 不公正的
例句1, It’s unfair to judge someone without knowing their full story.
不了解全部情况就评判一个人是不公平的。
例句2, The teacher’s unfair grading system caused a lot of complaints among the students.
老师不公平的评分系统在学生中引起了很多抱怨。
例句3, Life can be unfair, but we must learn to adapt and overcome challenges.
生活可能不公平,但我们必须学会适应并克服挑战。

unfit [ʌnˈfɪt]
形容词[a.]: 不合宜的, 不相宜的
例句1, The dress was unfit for the formal occasion, as it was too casual and revealing.
这件裙子不适合正式场合,因为它太随意和暴露了。
例句2, After months of inactivity, he felt unfit and decided to start exercising regularly.
经过几个月的缺乏运动,他感到身体不适,决定开始定期锻炼。
例句3, The old bridge was declared unfit for use after the safety inspection revealed significant structural damage.
安全检查发现严重结构损坏后,这座旧桥被宣布不适合使用。

unfold [ʌnˈfəʊld]
及物动词[vt.]: 展开, 打开
例句1, As the story unfolds, we learn more about the characters’ hidden motives.
随着故事的展开,我们逐渐了解到角色们隐藏的动机。
例句2, She carefully unfolded the letter, eager to read its contents.
她小心翼翼地展开信件,迫不及待地想阅读其中的内容。
例句3, The map unfolds to reveal the entire city in detail.
地图展开后,详细展示了整个城市的全貌。
例句4, The events of the day began to unfold in a way no one had anticipated.
当天的局势以一种无人预料的方式开始发展。

unfortunate [ʌnˈfəʊld]
形容词[a.]: 不幸的
例句1, It was an unfortunate accident that could have been prevented.
这是一场本可以避免的不幸事故。
例句2, She made an unfortunate choice that led to her downfall.
她做了一个不幸的选择,导致了她的失败。
例句3, The unfortunate news of his passing spread quickly through the community.
他去世的不幸消息迅速在社区传开。
例句4, Despite their unfortunate circumstances, they remained hopeful for the future.
尽管处境不幸,他们仍然对未来充满希望。

unfortunately [ʌnˈfɔːtjʊnətlɪ]
副词[ad.]: 不幸地
例句1, Unfortunately, the concert was canceled due to the sudden storm.
不幸的是,由于突然的暴风雨,音乐会被取消了。
例句2, She unfortunately missed the last train and had to stay overnight at the station.
她不幸错过了最后一班火车,不得不在车站过夜。
例句3, Unfortunately, the project did not meet the deadline despite our best efforts.
不幸的是,尽管我们尽了最大努力,项目还是没能按时完成。
例句4, He unfortunately lost his wallet while traveling in the crowded market.
他不幸在拥挤的市场旅行时丢失了钱包。

unhappy [ʌnˈfɔːtjʊnətlɪ]
形容词[a.]: 不高兴的,伤心的
例句1, She looked unhappy when she heard the news.
她听到这个消息时看起来很不高兴。
例句2, The unhappy child cried all night because he lost his favorite toy.
那个伤心的孩子因为丢了他最喜欢的玩具而哭了一整晚。
例句3, Despite the sunny weather, he felt unhappy about the upcoming exam.
尽管天气晴朗,他对即将到来的考试感到不高兴。
例句4, The unhappy ending of the movie left everyone in tears.
电影的不高兴结局让每个人都流下了眼泪。

unhealthy [ʌnˈhelθɪ]
形容词[a.]:不健康的,不卫生的
例句1, Eating too much junk food can lead to an unhealthy lifestyle.
吃太多垃圾食品会导致不健康的生活方式。
例句2, The air in the city is often unhealthy due to pollution.
由于污染,城市里的空气通常是不健康的。
例句3, An unhealthy obsession with social media can affect mental health.
对社交媒体不健康的痴迷会影响心理健康。

uniform [ˈjuːnɪfɔːm]
名词[n.]: 制服
例句1, The students were required to wear their school uniforms every day.
学生们被要求每天穿校服。
例句2, The military uniform symbolizes discipline and unity among the soldiers.
军装象征着士兵之间的纪律和团结。
例句3, The company introduced a new uniform policy to promote a professional image.
公司引入了新的制服政策以提升专业形象。
例句4, The uniform distribution of resources ensured fairness in the competition.
资源的均匀分布确保了竞争的公平性。
例句5, The artist used a uniform color palette to create a cohesive visual effect.
艺术家使用统一的色调来创造一种连贯的视觉效果。

unimportant [ʌnɪmˈpɔːt(e)nt]
形容词[a.]:不重要的,无意义
例句1, The issue seemed unimportant at first, but it later became a major concern.
这个问题起初似乎不重要,但后来却成为了一个主要关注点。
例句2, She dismissed his comment as unimportant and continued with her work.
她认为他的评论不重要,继续她的工作。
例句3, In the grand scheme of things, this mistake is relatively unimportant.
从大局来看,这个错误相对不重要。
例句4, He gave an unimportant reason for being late, which no one believed.
他给出了一个不重要的迟到理由,没有人相信。
例句5, The details of the contract are unimportant; what matters is the overall agreement.
合同的细节不重要,重要的是整体协议。

union [ˈjuːnjən]
名词[n.]: 联合,联盟;工会
例句1, The union of the two companies created a powerful new entity in the industry.
两家公司的联合在行业内创造了一个强大的新实体。
例句2, The workers formed a union to negotiate better wages and working conditions.
工人们组成了工会以谈判更好的工资和工作条件。
例句3, The union of art and technology has led to some of the most innovative designs in recent years.
艺术与技术的结合催生了近年来一些最具创新性的设计。

unique [jʊˈniːk]
形容词[a.]: 惟一的,独一无二的
例句1, Her unique talent for painting has won her numerous awards.
她独特的绘画才能为她赢得了无数奖项。
例句2, This antique vase is unique; there’s no other like it in the world.
这个古董花瓶是独一无二的,世界上没有其他像它一样的。
例句3, The company prides itself on offering unique solutions to complex problems.
该公司以提供复杂问题的独特解决方案为荣。

unit [ˈjuːnɪt]
名词[n.]: 单元, 单位
例句1, Each unit in the apartment complex has its own private balcony.
公寓楼里的每个单元都有自己的私人阳台。
例句2, The meter is a unit of length in the metric system.
米是公制中的长度单位。
例句3, The soldiers were divided into small units to cover more ground.
士兵们被分成小单位以覆盖更多的地面。
例句4, This textbook is divided into several units, each focusing on a different topic.
这本教科书分为几个单元,每个单元专注于不同的主题。

unite [jʊˈnaɪt]
动词[v.]: 联合, 团结
例句1, The nations must unite to combat climate change.
各国必须联合起来应对气候变化。
例句2, The community united to support the local food bank.
社区团结一致支持当地的食品银行。
例句3, The team united their efforts to win the championship.
团队齐心协力赢得了冠军。
例句4, The family united to celebrate their grandparents’ anniversary.
全家团聚庆祝祖父母的结婚纪念日。

universal [juːnɪˈvɜːs(ə)l]
形容词[a.]: 普遍的, 全体的
例句1, The concept of universal healthcare is widely supported in many countries.
全民医疗的概念在许多国家得到广泛支持。
例句2, The universal truth that hard work leads to success is often emphasized by educators.
努力带来成功这一普遍真理经常被教育者强调。
例句3, The universal language of music transcends cultural and linguistic barriers.
音乐这种通用语言超越了文化和语言的障碍。

universe [ˈjuːnɪvɜːs]
名词[n.]: 宇宙
例句1, The universe is vast and full of mysteries waiting to be discovered.
宇宙广阔无垠,充满了等待被发现的奥秘。
例句2, In this universe, every star has its own unique story to tell.
在这个宇宙中,每颗星星都有它自己独特的故事要讲述。
例句3, The concept of a multiverse suggests that our universe might be just one of many.
多元宇宙的概念表明,我们的宇宙可能只是众多宇宙中的一个。
例句4, Scientists are constantly exploring the universe to understand its origins and composition.
科学家们不断探索宇宙,以理解它的起源和构成。
例句5, The universe within a single atom is as complex as the cosmos itself.
单个原子内的宇宙与整个宇宙一样复杂。

university [juːnɪˈvɜːsɪtɪ]
名词[n.]: 大学
例句1, She was accepted into one of the top universities in the country.
她被国内一所顶尖大学录取了。
例句2, The university offers a wide range of courses for students to choose from.
这所大学为学生提供了广泛的课程选择。
例句3, He decided to pursue his research at the university after completing his undergraduate degree.
他决定在完成本科学位后继续在这所大学进行研究。
例句4, The university campus is known for its beautiful architecture and serene environment.
这所大学的校园以其美丽的建筑和宁静的环境而闻名。
例句5, The university’s alumni network is very active and supportive.
这所大学的校友网络非常活跃且支持性强。

unknown [juːnɪˈvɜːsɪtɪ]
形容词[a.]: 不知道的
例句1, The origins of this ancient artifact remain unknown to historians.
这件古老文物的起源对历史学家来说仍然未知。
例句2, She received a letter from an unknown sender, which made her curious.
她收到了一封来自未知发件人的信,这让她感到好奇。
例句3, The unknown variable in the equation made the problem more challenging.
方程中的未知变量使这个问题更具挑战性。

unless [ʌnˈles]
连词[conj.]: 如果不, 除非
例句1, Unless you study hard, you won’t pass the exam.
除非你努力学习,否则你不会通过考试。
例句2, I won’t go to the party unless you come with me.
除非你和我一起去,否则我不会去参加派对。
例句3, Unless it rains, we will have a picnic tomorrow.
如果不下雨,我们明天将去野餐。
例句4, She won’t forgive you unless you apologize sincerely.
除非你真诚地道歉,否则她不会原谅你。
例句5, Unless we act now, the problem will only get worse.
除非我们现在采取行动,否则问题只会变得更糟。

unlike [ʌnˈlaɪk]
介词[prep.]: 不像, 和…不同
例句1, Unlike his brother, he prefers quiet evenings at home.
与他的兄弟不同,他更喜欢在家安静地度过夜晚。
例句2, The weather today is unlike anything we’ve seen this season.
今天的天气与我们这个季节所见过的任何天气都不同。
例句3, Unlike the previous model, this car has better fuel efficiency.
与之前的型号不同,这辆车的燃油效率更高。
例句4, She was unlike anyone he had ever met before.
她与他以前见过的任何人都不同。

unmarried [ʌnˈmærɪd]
形容词[a.]: 未婚的, 独身的
例句1, She remained unmarried throughout her life, dedicating herself to her career.
她一生未婚,全身心投入事业。
例句2, In many cultures, being unmarried at a certain age is often frowned upon.
在许多文化中,到了某个年龄仍然未婚往往会受到非议。
例句3, The unmarried couple decided to live together to test their compatibility before marriage.
这对未婚情侣决定婚前同居,以测试彼此的契合度。

unpleasant [ʌnˈplez(ə)nt]
形容词[a.]: 使人不愉快的
例句1, The unpleasant smell from the garbage bin made everyone cover their noses.
垃圾桶里传来的难闻气味让每个人都捂住了鼻子。
例句2, She had an unpleasant experience at the restaurant due to the rude service.
由于服务态度粗鲁,她在餐厅里有一段不愉快的经历。
例句3, The weather turned unpleasant, with dark clouds and strong winds.
天气变得恶劣,乌云密布,狂风大作。

unsafe [ʌnˈseɪf]
形容词[a.]: 不安全的;危险的
例句1, The old bridge is unsafe for heavy vehicles.
这座旧桥对重型车辆来说不安全。
例句2, It’s unsafe to walk alone at night in this neighborhood.
在这个社区晚上独自走路是不安全的。
例句3, The chemicals in the lab are unsafe if not handled properly.
如果处理不当,实验室里的化学品是危险的。

unsuccessful [ʌnsəkˈsesfʊl]
形容词[a.]: 不成功,失败的
例句1, Despite his numerous attempts, his efforts to start a business were unsuccessful.
尽管他尝试了多次,但他创业的努力都失败了。
例句2, The team’s strategy in the final game was unsuccessful, leading to their defeat.
球队在决赛中的策略不成功,导致了他们的失败。
例句3, Her application for the scholarship was unsuccessful, but she remained optimistic about future opportunities.
她的奖学金申请没有成功,但她对未来机会仍然保持乐观。

until [ʌnˈtɪl]
介词[prep.]: 连词[conj.]:直到…为止
例句1, I will wait here until you return.
我会一直在这里等你回来。
例句2, We cannot start the meeting until everyone arrives.
直到所有人都到齐,我们才能开始会议。
例句3, She worked tirelessly until the project was completed.
她不知疲倦地工作,直到项目完成。
例句4, Until then, we will have to make do with what we have.
在那之前,我们只能凑合着用现有的东西。

untrue [ʌnˈtruː]
形容词[a.]: 不真实的, 假的
例句1, The rumor about the company’s bankruptcy is completely untrue.
关于公司破产的谣言完全不真实。
例句2, Her claim that she had never met him before was proven to be untrue.
她声称以前从未见过他,但事实证明这是假的。
例句3, It is untrue to say that all politicians are corrupt.
说所有政治家都是腐败的是不真实的。

unusual [ʌnˈjuːʒʊəl]
形容词[a.]: 不平常的, 异常的
例句1, It’s unusual to see snow in this tropical region.
在这个热带地区看到雪是异常的。
例句2, She has an unusual talent for playing the piano.
她有一种不平常的弹钢琴的天赋。
例句3, The unusual weather patterns have caused widespread concern.
不平常的天气模式引起了广泛的关注。
例句4, He wore an unusual hat that caught everyone’s attention.
他戴了一顶不平常的帽子,吸引了所有人的注意。
例句5, It’s unusual for him to be late; he’s usually very punctual.
他迟到是不平常的;他通常非常准时。

unwilling [ʌnˈwɪlɪŋ]
形容词[a.]: 不愿意的, 勉强的
例句1, She was unwilling to compromise on her principles, even when pressured by her peers.
她不愿意在原则问题上妥协,即使受到同伴的压力。
例句2, The manager seemed unwilling to address the employees’ concerns, which led to widespread dissatisfaction.
经理似乎不愿意解决员工们的担忧,这导致了普遍的不满。
例句3, Despite the urgent situation, he remained unwilling to take any action, much to everyone’s frustration.
尽管情况紧急,他仍然不愿意采取任何行动,这让所有人都感到沮丧。

up [ʌp]
副词[ad.]: 向上;在上方;起来;在…以上; 形容词[a.]: 上面的, 向上的, 上行的; 名词[n.]: 上升;上坡;上行;繁荣; 动词[v.]: 举起;拿起;提高; 介词[prep.]: 向(高处);向(在)……上(面)游
例句1, The bird flew up into the sky.
那只鸟飞上了天空。
例句2, She looked up at the stars.
她抬头看着星星。
例句3, The elevator is going up to the 10th floor.
电梯正在上升到10楼。
例句4, He picked up the book from the table.
他从桌子上拿起了书。
例句5, The company’s profits are up this quarter.
公司本季度的利润上升了。
例句6, They walked up the hill to get a better view.
他们走上山坡以获得更好的视野。
例句7, She put up her hand to ask a question.
她举起手来提问。
例句8, The cat jumped up onto the windowsill.
猫跳上了窗台。
例句9, The sun is up, so it’s time to start the day.
太阳升起来了,是时候开始新的一天了。
例句10, He is up for the challenge.
他准备好迎接挑战了。

upon [əˈpɔn]
介词[prep.]: 在……上面
例句1, The cat jumped upon the table.
猫跳到了桌子上。
例句2, She placed the book upon the shelf.
她把书放在了架子上。
例句3, Upon hearing the news, he immediately called his family.
一听到这个消息,他立即给家人打了电话。
例句4, The success of the project depends upon your dedication.
项目的成功取决于你的奉献。

upper [ˈʌpə]
形容词[a.]: 较高的, 较上的
例句1, She reached for the upper shelf to grab the book.
她伸手去拿上层书架上的书。
例句2, The upper floor of the house offers a stunning view of the city.
房子的上层可以欣赏到城市的壮丽景色。
例句3, He always tries to maintain an upper hand in negotiations.
他总是试图在谈判中保持优势。
例句4, The upper class often attends exclusive social events.
上层阶级经常参加专属的社交活动。
例句5, The upper part of the mountain is covered in snow all year round.
山顶部分全年被雪覆盖。

upset [ʌpˈset]
形容词[a.]: 心烦的, 苦恼的
例句1, She was visibly upset after hearing the disappointing news.
听到令人失望的消息后,她明显心烦意乱。
例句2, The upset child refused to eat his dinner, tears streaming down his face.
那个苦恼的孩子拒绝吃晚饭,眼泪顺着脸颊流下来。
例句3, His upset stomach kept him from enjoying the delicious meal.
他胃部不适,无法享受这顿美味的饭菜。

upstairs [ʌpˈsteəz]
副词[ad.]: 在楼上, 到楼上
例句1, She went upstairs to fetch her book.
她上楼去拿她的书。
例句2, The children are playing upstairs, making a lot of noise.
孩子们在楼上玩耍,发出很多噪音。
例句3, He carried the heavy box upstairs with great effort.
他费了很大力气把那个沉重的箱子搬上楼。
例句4, The guest room is located upstairs, next to the bathroom.
客房在楼上,紧挨着浴室。
例句5, She tiptoed upstairs so as not to wake the baby.
她蹑手蹑脚地上楼,以免吵醒宝宝。

upward [ˈʌpwəd]
副词[ad.]: 向上;往上
例句1, The balloon floated upward into the clear blue sky.
气球向上飘入晴朗的蓝天。
例句2, She glanced upward at the towering skyscraper.
她向上瞥了一眼高耸的摩天大楼。
例句3, The company’s profits have been trending upward for the past three quarters.
公司利润在过去三个季度一直呈上升趋势。
例句4, He climbed upward along the steep mountain path.
他沿着陡峭的山路向上攀登。
例句5, The temperature is expected to rise upward of 30 degrees Celsius tomorrow.
预计明天温度将上升到30摄氏度以上。

urban [ˈɜːbən]
形容词[a.]: 城市的, 都市的
例句1, The urban landscape was filled with towering skyscrapers and bustling streets.
城市景观中充满了高耸的摩天大楼和繁忙的街道。
例句2, She preferred the urban lifestyle, with its convenience and endless opportunities.
她更喜欢城市生活方式,因为它的便利和无尽的机会。
例句3, Urban development has led to the expansion of cities and the creation of new neighborhoods.
城市发展导致了城市的扩张和新社区的形成。
例句4, The urban population has been growing rapidly due to migration from rural areas.
由于农村地区的移民,城市人口一直在迅速增长。
例句5, Urban planning is essential to ensure sustainable growth and improve the quality of life in cities.
城市规划对于确保可持续增长和提高城市生活质量至关重要。

urge [ɜːdʒ]
动词[v.]: 敦促, 催促, 力劝
例句1, She felt an urge to call her friend and share the exciting news.
她感到一种强烈的冲动,想打电话给朋友分享这个令人兴奋的消息。
例句2, The teacher urged the students to study harder for the upcoming exams.
老师敦促学生们为即将到来的考试更加努力学习。
例句3, He couldn’t resist the urge to buy the new gadget, even though he didn’t really need it.
他无法抗拒购买新小工具的冲动,尽管他并不真正需要它。
例句4, The environmentalist urged the government to take immediate action against climate change.
环保主义者敦促政府立即采取行动应对气候变化。

urgent [ˈɜːdʒənt]
形容词[a.]: 紧急的, 紧迫的
例句1, The doctor said the surgery was urgent and needed to be performed immediately.
医生说手术很紧急,需要立即进行。
例句2, She received an urgent message from her boss, asking her to return to the office right away.
她收到了老板的紧急消息,要求她立即返回办公室。
例句3, The government declared an urgent need for volunteers to help with the disaster relief efforts.
政府宣布急需志愿者帮助救灾工作。

use [juːz]
名词[n.]: 及物动词[vt.]:利用,使用,应用
例句1, She decided to use her savings to travel the world.
她决定用她的储蓄环游世界。
例句2, He knows how to use the new software efficiently.
他知道如何高效地使用新软件。
例句3, The teacher encouraged the students to use their imagination in their essays.
老师鼓励学生在作文中运用他们的想象力。
例句4, They use recycled materials to create eco-friendly products.
他们利用回收材料制造环保产品。
例句5, Can I use your phone to make a quick call?
我可以用你的手机打个电话吗?

used]
形容词[a.]: 用过的;旧的;二手的
例句1, She bought a used car to save money.
她买了一辆二手车来省钱。
例句2, The used bookshelf still looks sturdy and functional.
这个旧书架看起来仍然坚固且实用。
例句3, He found a used phone that works perfectly fine.
他找到了一部用过的手机,用起来完全没问题。

useful [ˈjuːsfʊl]
形容词[a.]: 有用的, 有益的
例句1, This book is very useful for understanding complex scientific concepts.
这本书对于理解复杂的科学概念非常有用。
例句2, She gave me some useful advice on how to improve my presentation skills.
她给了我一些关于如何提高演讲技巧的有用建议。
例句3, The new software tool is extremely useful for data analysis.
这款新的软件工具对于数据分析非常有用。
例句4, He found the map to be very useful during his hiking trip.
他在徒步旅行中发现这张地图非常有用。
例句5, The workshop provided useful insights into the latest marketing strategies.
这次研讨会提供了关于最新营销策略的有用见解。

useless [ˈjuːslɪs]
形容词[a.]: 无用的
例句1, The old, broken clock was completely useless and couldn’t tell time anymore.
那个旧坏掉的钟完全没用了,再也无法显示时间。
例句2, She felt useless after her team completed the project without her help.
她的团队在没有她帮助的情况下完成了项目,她感到自己毫无用处。
例句3, The instructions were so vague that they were practically useless.
这些说明太模糊了,几乎毫无用处。

user [ˈjuːzə]
名词[n.]: 使用者;用户
例句1, The software is designed to be user-friendly, making it easy for even a novice to navigate.
该软件设计得用户友好,即使是新手也能轻松操作。
例句2, As a frequent user of public transportation, she knows all the best routes to avoid traffic.
作为公共交通的频繁使用者,她知道所有避开交通拥堵的最佳路线。
例句3, The new policy aims to protect the rights of the end user by ensuring product safety.
新政策旨在通过确保产品安全来保护终端用户的权利。
例句4, He is a power user of the application, utilizing all its advanced features to enhance productivity.
他是该应用程序的高级用户,利用其所有高级功能来提高生产力。

usual [ˈjuːʒʊəl]
形容词[a.]: 通常的, 平常的
例句1, It’s usual for him to take a walk after dinner.
他晚饭后散步是平常的事。
例句2, She arrived at the usual time, not a minute early or late.
她按平常的时间到达,不早不晚。
例句3, The usual suspects were questioned by the police.
警方盘问了那些平常的嫌疑人。

usually [ˈjuːʒʊəlɪ]
副词[ad.]: 通常, 经常
例句1, She usually takes the bus to work in the morning.
她通常早上乘公交车去上班。
例句2, He usually finishes his homework before dinner.
他通常在晚饭前完成作业。
例句3, They usually go for a walk after lunch.
他们通常在午饭后去散步。
例句4, It usually rains a lot in this region during the summer.
这个地区夏天通常雨水很多。
例句5, We usually meet at the café on weekends.
我们通常周末在咖啡馆见面。