我买了一枚戒指，留作对希腊的纪念。

I bought the ring as a souvenir of Greece.

《牛津词典》

她把那些信留作纪念。

She kept the letters for sentimental reasons.

《牛津词典》

许多父母在将钱留作大学学费时，然而有些则在进行另一项巨大开支：为他们十几岁的孩子们买车。

While many parents are putting money aside for college tuition, some are taking on another big expense: buying cars for their teenagers.

《柯林斯英汉双解大词典》

Well, now one of the things farmers in history discovered is that it's very hard to do well as a farmer if all you do is grow the crops, because people normally don't use what you grow in the form in which you grow it.

关于农民我们在历史上能够得知的一件事是,当好农民很困难,特别是只种农作物的农民,因为人们一般不会将,你从地里种出来的东西留作种子

耶鲁公开课 - 古希腊历史简介课程节选