stroke efficiency
... 劈水动作（蛙泳）：wedge action 划水动作效率：stroke efficiency 划水动作错误：stroke defect ...
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有些人在有仰泳时有沉肘的倾向，就是他们用肘部来带动手的动作。这个动作应该避免，因为这个动作可能会降低划水效率。
Swimmers have a tendency to drop the elbow in backstroke. That is, they let the elbow lead the hand. This should be avoided, as it decreases stroke efficiency.
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