She went for a long walk to work up an appetite.

她为了增加食欲散了很长时间的步。

《牛津词典》

Even if you are not prepared to work up a sweat three times a week, any activity is better than none.

即使你不准备1周流3次汗，任何活动总比没有要好。

《柯林斯英汉双解大词典》

Once there, we are introduced to her fellow campers, Sally stands by them, holding my hand, horror in her eyes, trying to work up the courage to join a game of soccer.

一到那里，我们被介绍给她的同伴们。莎莉站在他们旁边，握着我的手，眼中充满恐惧，试图鼓起勇气参加一场足球比赛。

youdao

Her work "Variations on H" is made up of different colors of finely made hands connected together to form a flowing cloth.

VOA: special.2009.11.04

And I end up going back and doing unit testing anyway, to try and figure out why it doesn't work. So over the years, I've just convinced myself I might as well start where I'm going to end up.

第一次从来不会正常运行,因此无论如何我还要回头去做单元测试,找找哪儿出错了，因此经过这么多年，我已经说服自己既然一定要做单元测试,那么还是一开始就做最好了。

麻省理工公开课 - 计算机科学及编程导论课程节选

so I don't know, I think it's just really cool to be able to work something from the ground up.

所以，我不知道，我就是觉得能从头开始做一件事很酷。

什么是认知科学？ - SpeakingMax英语口语达人

Trust that as your interest develops, it will be easy to work up to six hours.

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To get the best effect you will need to work up a sweat.

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And we've just got, at this point, to work up the political courage to do what's required to be done.

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