And the third operates its legs and feet.
第三个人操作腿和脚。
the third variant of back extention with legs' genuflection
双腿背部伸展式变体三式
When you are swimming freestyle, kick legs hard and don't forget to breath every third stroke.
游自由式时要用力踢腿,而且别忘记每三下换一次气.
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