secretion

名词 secretion:

1. the organic process of synthesizing and releasing some substance
   同义词：secernment
2. a functionally specialized substance (especially one that is not a waste) released from a gland or cell

1. Saliva is secretion of the salivary glands.
   唾液是唾液腺的分泌物。
2. The secretion of bile is useful for our bodies.
   胆汁的分泌对我们的身体很有用处。