salivary gland

例句：

1. 1. The doctor advised him to keep his mouth closed during the procedure.
   医生建议他在手术期间保持嘴巴闭合。
2. 2. The scientist studied the structure of the salivary glands in the animal.
   科学家研究了动物唾液腺的结构。
3. 3. Saliva is essential for digestion and helps wash away food particles from the mouth.
   唾液对于消化至关重要，并有助于将食物颗粒从口腔中冲走。