灵活性和力量的结合是蛙泳蹬腿独特的部分。
The unique part about the breaststroke kick is the combination of flexibility and the combination of strength.
蹬腿是蛙泳中最重要的一个环节。
The kick aspect of breaststroke is the most important aspect.
蹬腿就是两条腿同时蹬出，称之为“蛙”式腿或蛙泳腿，蹬腿时采用交替式打水或海豚式都是不允许的。
The kick is a simultaneous thrust of the legs called a "frog" or breaststroke kick. No flutter or dolphin kicking is allowed.
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