Definition
to make a great effort to think of or remember something.
費盡心思
I've been racking my brains trying to figure out how to solve this problem.
我一直在絞盡腦汁試圖找出解決這個問題的方法。
She racked her brain, but still couldn't remember where she put the keys.
她絞盡腦汁，但仍然想不起來她把鑰匙放在哪裡。
The students racked their brains trying to answer the difficult questions the teacher posed.
學生們絞盡腦汁試圖回答老師提出的難題。