Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
每一个发囊下面连着一个很小肌肉叫做立毛肌。
Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
每一个发囊下面连着一个很小肌肉叫做立毛肌。
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