secretion substance

• 分泌物

secretion substance的用法和样例：

例句

1. Saliva is secretion of the salivary glands.
   唾液是唾液腺的分泌物。
2. When the bubbles are coarse it signifies that the secretion originates in the pharynx or nasal cavities.
   气泡大时表示分泌物来自咽腔或鼻腔。