保持手臂在你旁边，专注于旋转肩部露出水面在每个动作周期中。
Hold the arm at your side and focus on rotating the shoulder out of the water on each stroke.
运用运动生物力学的基本原理，结合田径运动理论知识，对短跑的动作周期划分为“后蹬”、“着地缓冲”等问题进行了剖析。
Based on the biomechanics basics and the knowledge of the track and field, the essay argued on the sprint skill periods and the term of "leg drive", "the buffer after landing", and so on.
在触壁前的最后一个划水动作结束后，头可以潜入水中。但在触壁前最后一个完整或不完整动作周期中，头的某一部分应露出水面。
The head may be submerged after the last arm pull prior to the touch, provided it breaks the surface of the water at some point during the last complete or incomplete cycle preceding the touch.
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