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.
“化学分析结果是什么，吉姆？”亚当斯紧张地旋转着他身前的椅子。
"Chemical analysis of the matter, Jim?" Adams asked, nervously spinning the chair in front of him.
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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