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如果你能看到约半个足弓，那么你是最普遍的足型，旋前肌也正常。

If you see about half of your arch, you have the most common foot type and are considered a normal pronator.

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迎角、旋成体的外形，尤其是头部的几何形状是细长前体出现非对称涡的关键因素。

Angle of attack and nose shape of bodies are key factors that asymmetric vortex occurs over slender bodies.

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