The start in back stroke and medley relay races shall be from the water.
仰泳和混和接力泳的出发是在水中。
Freestyle, butterfly, back stroke and breast stroke are four commonly seen strokes in swimming competition.
自由泳、蝶泳、仰泳和蛙泳是游泳比赛中常见的四种泳姿。
Never breathe on your first stroke, except on back and breaststroke.
除了仰泳和蛙泳，绝对不要在第一次划臂时呼吸。
Yet a stroke therewith may break a man's back.
可用它可敲断人的脊梁骨。
We believe exercise gives individuals a way to fight back against stroke disabilities.
我们相信，使个人行使的方式反击中风残疾。
You need to use your back muscles to swim the butterfly-stroke.
你必须用你背部的肌肉来游蝶泳。
You need to use your back muscles to swim the butterfly-stroke.
你必须用你背部的肌肉来游蝶泳。
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