• The hair shaft and inner root sheath move together as the hair grows toward the surface: the outer root sheath remains fixed in position.

    毛干到达体表时融合在一起根鞘仍然保持原来的位置

    youdao

  • The hair shaft and inner root sheath move together as the hair grows toward the surface: the outer root sheath remains fixed in position.

    毛干到达体表时融合在一起根鞘仍然保持原来的位置

    youdao

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