up and down
上下, 来回
例句1, The elevator goes up and down between the floors.
电梯在楼层之间上下移动。
例句2, She was pacing up and down the room, thinking about the problem.
她在房间里来回踱步，思考着这个问题。
例句3, The stock market has been going up and down all week.
股市本周一直在上下波动。
例句4, He looked up and down the street for his lost dog.
他在街上来回寻找他丢失的狗。
例句5, The children were jumping up and down with excitement.
孩子们兴奋地跳上跳下。

used to sth.
习惯于
例句1, She is used to waking up early every morning.
她习惯于每天早上早起。
例句2, He quickly got used to the new environment at his workplace.
他很快就习惯了工作场所的新环境。
例句3, They are used to dealing with difficult customers in their line of work.
他们在工作中习惯于处理难缠的顾客。
例句4, The children are used to eating dinner at 6 PM sharp.
孩子们习惯于在晚上6点准时吃晚饭。
例句5, After living abroad for years, she is used to speaking multiple languages daily.
在国外生活多年后，她习惯于每天说多种语言。

used to do sth.
过去常常
例句1, I used to play basketball every weekend when I was in high school.
我过去常常在高中时每个周末打篮球。
例句2, She used to live in New York before moving to Los Angeles.
她过去常常住在纽约，后来搬到了洛杉矶。
例句3, We used to go camping in the mountains during the summer.
我们过去常常在夏天去山里露营。
例句4, He used to be a teacher before he became a writer.
他过去常常是一名教师，后来成为了一名作家。
例句5, They used to visit their grandparents every holiday.
他们过去常常每个假期都去看望祖父母。