[tǔ qǐ fú jǔ]   

兔    起    凫    举    凫：野鸭。象兔敢奔跑，象野鸭急飞。比喻行动迅速。 褒义>

凫：野鸭。像兔敢奔跑，像野鸭急飞。比喻行动迅速。

As fast as the hare runs and as swift as the wild duck starts flying

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