precipitin serum

例句：

1. 1. The precipitation of the drug in the body is a significant factor in its effectiveness.
   药物在体内的沉淀是其有效性的一个重要因素。
2. 2. The precipitation of calcium chloride from solution is a common occurrence in chemical reactions.
   钙氯化物从溶液中沉淀是一种常见的化学反应现象。
3. 3.The precipitation of salts from seawater is a crucial step in the desalination process.
   海水中盐的沉淀是脱盐过程的关键步骤。