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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。
youdao
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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。
youdao
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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。
youdao