Contributing to that very efficient technique is his arm stroke.
高效的技巧取要归功于的划臂。
The difference between swimmers is how the arm stroke is used to produce thrust.
不同的游泳运动员之间的区别很大一部分就是如何使用手臂的划水来产生前推力。
Then try a few single-arm strokes with each arm, building into full stroke swimming.
然后试着做些单臂与另一个手臂的交替练习，建设成为全程游泳的练习。
Start with a length of each stroke with one arm held down to your side.
开始每个有距离的泳姿只用一只胳膊。
Start with a length of each stroke with one arm held down to your side.
开始每个有距离的泳姿只用一只胳膊。
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