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当：阻挡。螳螂举起前肢企图阻挡车子前进。比喻做力量做不到的事情，必然失败。
[overrate oneself as a mantis trying to stop a chariot;kick against the pricks;throw straws against the wind] 螳螂奋举腿臂以阻挡车轮。比喻自不量力,招致失败
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