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从大坛子里捉王八。比喻想要捕捉的对象已在掌握之中。形容手到擒来，轻易而有把握。
[have full assurance to get go after an easy prey as one who catches a tuttle in a jar] 比喻要捕捉的对象无处逃遁,下手即可捉到,很有把握
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