So there will be parts of the class that'll be easier for some than others, but overall I'm not expecting you to learn a lot of detail but mainly the big picture, as I said.

所以我们的课程对大家来说,有的觉得困难,有的觉得容易,但总而言之,我不要求你们纠缠于细节,主要还是抓重点,我之前说过了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So I think that it's true that the economy is difficult and there is big challenge in front of us.

所以我觉得，目前的经济形势真的很困难，我们面临着很大的挑战。

事业就是挑战 - SpeakingMax英语口语达人