It's a problem set where we've worked pretty hard to write some problems that we think will provide you with a good learning experience.

我们为了写出这个问题集,让大家好好学习下课没少侠功夫,你们应该通过材料来学习学习它。

麻省理工公开课 - 计算机科学及编程导论课程节选

I probably would not have worked as hard, and you don't need to.

说不定就不像现在这样用功学习了，因为没有这种压力，我可能不需要这么用功。

都是天才 - SpeakingMax英语口语达人

Were you and the president and everybody else in the White House worked as hard as you could, but things just sort of run away, took on a life of its own.

你们在白宫,尽心尽力地工作,但形势却还是会失控吗，就像是自己有想法似的。

普林斯顿公开课 - 国际座谈会课程节选