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使人头痛的事;棘手的事;难题
If you say that something is a headache, you mean that it causes you difficulty or worry.
例句
The airline's biggest headache is the increase in the price of aviation fuel...
令航空公司最头痛的事就是航空燃料价格的上涨。
This is a real headache for us.
这对我们来说真是个难题。