伤脑筋

shāng nǎojīn

to be a real headache; to find sth a real headache

HSK 7-9

Pronunciation

shāng nǎojīn

这道数学题真伤脑筋，我想了很久还是做不出来。

zhè dào shùxué tí zhēn shāng nǎojīn, wǒ xiǎng le hěn jiǔ háishi zuò bu chūlái.

This math problem is a real headache; I've thought about it for a long time but still can't solve it.

One fixed sample

Full mock exams are available in HSKReady.