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大雁飞过时也能拔下毛来。原形容武艺高超。后比喻人爱占便宜，见有好处就要乘机捞一把。
[spare no effort in taking advantage of what one puts his hand on] 大雁飞过都要伸手拔几根毛,比喻凡是过手的事都要得些好处,绝不轻易放过
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