put on one’s thinking cap 开动脑筋；动脑筋想；认真考虑（问题、困难等）

【例句】
Before making a decision, it's important to put on your thinking cap and carefully consider all the possible implications.
在做决定之前，重要的是要集中思考，仔细考虑所有可能的影响。

We need to put on our thinking cap，to find a solution.
我们需要认真思考，寻找解决办法。