伤脑筋

fēng zǒng shì zhè me guā zhēn shāng nǎo jīn

风总是这么刮，真伤脑筋。

It is a nuisance the way it keeps on blowing.

tā wèi zhè xiē shì shāng nǎo jīn

他为这些事伤脑筋。

He puzzled his brains about the matter.

fàn bu zháo wèi zhè shì shāng nǎo jīn

犯不着为这事伤脑筋。

It is not worth troubling oneself over this matter.

shāng nǎo jīn de wèn tí

伤脑筋的问题

a knotty problem

wèi mǒu shì shāng nǎo jīn

为某事伤脑筋

trouble one's mind about something

wǒ zuì shāng nǎo jīn de shì pīn xiě chū cuò

我最伤脑筋的是拼写出错。

Spelling is my Achilles' heel.