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蹶：栽跟头；振：振作。一跌倒就再也爬不起来。比喻遭受一次挫折以后就再也振作不起来。
[collapse after one setback;be in shambles;curl up;never be able to recover after a setback] 一遭到失败或挫折就再也振作不起来
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