给头发提供一个穿透头发直达内皮层的提高抗拉强度的作用。
Improvement in tensile strength to give body and texture by penetrating the hair reaching the inner cortex.
周皮发生较迟，其木栓形成层由紧靠内皮层的皮层细胞产生。
The formation of periderm is relatively late and cork cambium is come from the cortex cells which arenear endodermis.
作为对紫外线灼伤内皮层的反应，你的身体会产生更多的黑色素使皮肤颜色变深。
In response to the UV rays frying your inner layer of skin, your body produces more melanin pigment that darkens the skin.
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