Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
立毛肌：每
个发囊
着个很小的肌肉叫做立毛肌。
Arrector Pil : Each hair follicle has a tiny muscle called the arrector pili attached to it.
立毛肌：每个发囊着个很小的肌肉叫做立毛肌。
Arrector Pili are tiny muscles attached to the base of the hair follicles.
竖毛肌（立毛肌）是些附着在毛囊底部的细小的肌肉。
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