身前的划水过中线造成你在水中蛇形，这会拉你偏离航向。
Crossing over at the front of the stroke causes you to snake in the water. This pulls you off course.
不好的身体滚动，低摆臂和过中线是造成肩伤的主要原因。
Poor rotation, low swinging arms and cross-overs are the major causes of shoulder injury.
身前的划水过中线易于使你的肘部下沉，而且破坏你的抓水和损害你的动力。
A cross over at the front of the stroke tends to cause your elbow to drop, also damaging your catch and hurting your propulsion.
另外你那些刚开始出现问题如剪刀腿和手过中线，所有这些都是因为你没有呼气。
Other problems with your technique start to appear such as scissor kicks and hands crossing the centre line. All of this because you're not exhaling!
结果以过ANS点垂直于两侧颧额点连线的直线为面中线，其正中结构指数和侧方结构指数均值较小。
Results The middle line through ANS and perpendicular to zygomaticofrontal line has less mean of middle structure index and side middle structure index.
结果以过ANS点垂直于两侧颧额点连线的直线为面中线，其正中结构指数和侧方结构指数均值较小。
Results The middle line through ANS and perpendicular to zygomaticofrontal line has less mean of middle structure index and side middle structure index.
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