What do you do when you're stuck with a question while studying Physics?

当你在学习物理时被一个问题难倒了怎么办？

学习和交际都重要 - SpeakingMax英语口语达人

These won't be graded, you don't have to turn them in, it's just to give you some extra practice if you want while you're studying for the exam.

这些题目不会记分，你们也不需要交上来，只是如果你需要的话，这可以让你,在准备考试的过程中得到更多的训练。

麻省理工公开课 - 化学原理课程节选

I thought London gives me enough to do for the next four years while I am studying to have a life.

我觉得在我学会在这里生活的时候，伦敦给予了我足够在未来四年里可以做的事情。

世界就是我的故乡 - SpeakingMax英语口语达人