flutter kick
柯林斯词典
1. N a type of kick used in certain swimming strokes, such as the crawl, in which the legs are held straight and alternately moved up and down rapidly in the water (游泳运动中腿部)打水
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1. N a type of kick used in certain swimming strokes, such as the crawl, in which the legs are held straight and alternately moved up and down rapidly in the water (游泳运动中腿部)打水