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The skin is an active organ, which protects, secretes, excretes and regulates temperature.
皮膚是十分活躍的身體組織，它能起到保護、分泌、排泄和調節體溫的作用。
It even acts as a sense organ. The skin has 3 layers: epidermis, dermis and subcutaneous tissue.
它還是人體的感覺器官之一。皮膚由表皮、真皮、皮下組織三層組成。
The epidermis has several thin layers of cells. The deepest layer produces new cells. The new cells move slowly toward the skin surface where they replace the dead cells.
上皮由幾層很薄的細胞組成。最下面的一層生成新細胞。新細胞逐漸靠近皮膚表層，替換死細胞。
The dermis is a thicker skin layer. It contains nerve fibers, blood vessels, sweat glands, sebaceous glands and hair follicles.
真皮層較厚。其中包含神經纖維、血管、汗腺、皮脂腺和毛囊。
Sebaceous glands secrete sebum into the hair follicles and lubricate the skin and hair. The sweat excreted cools the body by evaporation.
皮脂腺向毛囊分泌油脂，使皮膚和毛發光滑。排汗會通過蒸發而降低體溫。
The oral mucosa does not have sebaceous or sweat glands, hair follicles.
口腔黏膜沒有皮脂腺、汗腺以及毛囊。
Instead, salivary glands secrete saliva through ducts at the base of the mouth. Saliva helps clean and keep external mucosa wet.
而唾液腺通過口腔底部的排泄管分泌唾液。唾液幫助外部口腔黏膜保持清潔濕潤。
The subcutaneous layer contains blood vessels, nerves, lymph and loose connective tissue. Subcutaneous tissue also supports upper skin layers.
皮下組織包括血管、神經、淋巴和疏松結締組織。皮下組織還對其上層皮膚起到支撐作用。
The skin and mucosa exchange oxygen, nutrient and fluids with underlying blood vessels, make new cells and get rid of dead cells.
皮膚和黏膜與其下的血管交換氧氣、營養物質以及液體，生成新細胞，清除死細胞。
They need enough nutrition and circulation to resist diseases. When a person's basic condition changes, the skin often shows this by some change in color, thickness, texture, turgor, and temperature.
皮膚需要足夠的營養和血液流通來抵御疾病。人體一些基本情況的變化會體現在皮膚的顏色、厚度、紋理、腫脹程度以及溫度的變化上。
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