双交叉
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double cross - over 端发生双交换
three-strand double cross-over 三股双交换
double cross-over 双交换型
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.
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。
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