We’re all scratching our heads for an answer to the problem.

为了找到这个题的答案我们都绞尽脑汁。

I’ve been racking my brains all day trying to remember his name.

我一整天都绞尽脑汁，想要回忆起的。

His classmates were labouring with elementary algebra.

的同学们正在绞尽脑汁地演算初等数题。

He had to rack his brains to solve that complicated problem.

不得不绞尽脑汁去解决那个题。

He puzzled himself over the matter.

对那件事绞尽脑汁。

She is worrying the problem out.

她正在绞尽脑汁解决这个题。

All night I have been tossing and turning racking my brains to think what could have possessed the young man to kill himself.

整整一晚我辗转反侧, 绞尽脑汁, 想弄明白是什么原因竟能促成这个年轻人自杀。