题目内容
The epidermis is made up mainly of skin cells called keratinocytes. Keratin means (two words)
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The English expression for 防水层 is.
Goosebumps appear when people feel cold, andcause hair to stand upright across the body. (two words)
Skin is the largest organ in our body.
Sebum is an oily substance that's secreted onto the skin's surface by sebaceous glands nestled inside the hypodermis.
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