[shāng nǎo jīn]
cause sb. enough headache; knotty; troublesome; bothersome
a knotty problem; headache
傷腦筋的問題
It is a nuisance the way it keeps on blowing.
風總是這么刮, 真傷腦筋。
It's rather troublesome.
這事真傷腦筋。
He puzzled his brains about the matter.
他為這些事大傷腦筋。