... 键盘 keyboard 天平指针突跳 kicking of balance 天平指针突跳 kicking of balance ...
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Effective dolphin kicking is done with relaxed ankles which pull the water and provide a point of balance and leverage for the swimmer.
放松的踝关节是高效的海豚踢的关键，让泳者保持平衡并给予发力点。
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