Arrector Pili are tiny muscles attached to the base of the hair follicles.
竖
（立）是
些附
在
底部的细小的肉。
Arrector Pili are tiny muscles attached to the base of the hair follicles.
竖（立）是些附在底部的细小的肉。
Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
立：
发下面连很小的肉叫做立。
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