A RAVEN saw a Swan and desired to secure for himself the same beautiful plumage. —
一只乌鸦看到了一只天鹅，并渴望拥有同样美丽的羽毛。 —

Supposing that the Swan’s splendid white color arose from his washing in the water in which he swam, the Raven left the altars in the neighborhood where he picked up his living, and took up residence in the lakes and pools. —
假设天鹅那绝妙的洁白色是由它在游泳的水中清洗得来的，乌鸦离开了附近的祭坛，它从中谋生，搬到了湖泊和池塘中居住。 —

But cleansing his feathers as often as he would, he could not change their color, while through want of food he perished.
然而，尽管它经常清洁羽毛，却无法改变它们的颜色，而且由于缺乏食物而死亡。

Change of habit cannot alter Nature.
改变习惯不能改变天性。