To be at one's wit's end; to have no more schemes or plans left; to have exhausted all stratagems.
面对突如其来的困境，他感到计无所施，不知该如何应对。
Faced with the sudden dilemma, he felt at his wit's end and didn't know how to respond.
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To be at one's wit's end; to have no more schemes or plans left; to have exhausted all stratagems.