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.

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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.

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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.

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