... 两臂交替划水：alternate arm [hand-over-hand] stroke 双臂仰泳：double overarm back-stroke 手臂交叉动作：scything arm action ...
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双臂仰泳
Double arm backstroke
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果你总是在仰泳划水的时候手臂过肩线，那么这个双臂练习就会让你很难做到，因为你必须在移臂时手臂交叉才能做到那样。
If you consistently over-reach on your backstroke pull, double-arm makes this very tough to do, because you have to cross your arms during the recovery to accomplish that.
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