... 风帆冲浪 windsurf ; Windsurfing 顶风帆 flapping of a sail 顺风帆 spinnaker ...
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"Flap" sounds like something (a flag, a sail) flapping, and "flop" is the dull sound of something falling down flat.
而flop听着就象什么东西直直落地发出的沉闷一响.
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