绞尽脑汁

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

为了找到这个问题的答案我们都。

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

我一整天都，要回忆起他的名字。

His classmates were labouring with elementary algebra.

他的同学们正在地演算初等数题。

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

他不得不去解决那个复杂问题。

He puzzled himself over the matter.

他对那件事。

She is worrying the problem out.

她正在解决这个问题。

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, , 弄明白是什么原因竟能促成这个年轻人自杀。