一生中，毛囊皮脂腺单位逐渐减少，主要的原因是次级毛囊生长能力较低。
The density of pilosebaceous units decreases throughout life, mainly because of the poor development of the secondary follicles.
一生中，毛囊皮脂腺单位逐渐减少，主要的原因是次级毛囊生长能力较低。
The density of pilosebaceous units decreases throughout life, mainly because of the poor development of the secondary follicles.
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