put your thinking cap on 认真思考，开动脑筋

如果你 “put your thinking cap on（戴上你的思考帽子）”，那么你就在 “认真思考某件事情”。在遇到一个需要通过深思熟虑去解决的难题时，就可以使用这个表达。

例句

This exam will be difficult. However, if you put your thinking cap on, you'll be fine.

这场考试会很难。不过，只要你认真思考作答，就没问题。

I didn't know how to work out the math problem at first, but I put my thinking cap on and found the answer.

我起初不知道该怎样解答这道数学题，但在仔细思考之后，我找到了答案。

We'll need to put our thinking caps on to solve this riddle.

我们需要开动脑筋，才能解开这个谜语。