The watery mixture of secretions from the salivary and oral mucous glands that lubricates chewed food, moistens the oral walls, and contains ptyalin.
英
美
释义
唾液:唾液腺和口腔粘膜腺分泌的水状混和物,用来润滑咀嚼过的食物,湿润口腔壁,并含有唾液淀粉酶
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