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The English expression for 防水层 is.
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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.
Under warm conditions, the skin's sweat glands will secrete sweat via ducts onto the surface, transferring heat out of the body.
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