当对侧手向后推水，达到最快的划水速度和最大推进力的时候，移臂开始加速，驱动手掌前伸入水。
The arm recovery accelerates and the hand drives forward into the water while the opposite hand pushes back achieving maximum hand velocity and propulsion.
但是这一手术就有危险性，尤其是对于心脏病病人和对侧颈动脉病变病人。
But that can be risky, especially for patients with heart damage or problems in the other carotid artery.
或肘部能与胸壁相贴，但手不能放于对侧肩上即为阳性。
When the hand of the affected side is placed on the opposite shoulder the elbow cannot be made to touch the chest.
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