The watery mixture of secretions from the salivary and oral mucous glands that lubricates chewed food, moistens the oral walls, and contains ptyalin.

• 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