束手無策；無計可施；黔驢技窮

英譯：
at one's wits' end

例句：

• I'm at my wits' end with this problem. (我對這問題無計可施)
• I have a problem that has me at wits' end, and I'm hoping you can help. (我有個問題使我束手無策，我期望你能幫忙)

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