Somehow, when I told you to invert the transformation, some of you had some difficulty.
我上次让你们逆推变换公式的时候,有的同学觉得很困难
耶鲁公开课 - 基础物理课程节选
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
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