precipitation reaction

例句：

1. 1. The process of precipitation is crucial in the formation of ice crystals.
   沉淀过程在冰晶形成中至关重要。
2. 2.In chemistry, precipitation reactions are used to separate impurities from a solution.
   在化学中，沉淀反应用于从溶液中分离杂质。
3. 3. The precipitation reaction between copper(II) ions and hydroxide ions produces copper(OH)2, which then precipitates out as a white powder.
   铜离子和氢氧根离子之间的沉淀反应产生氧化铜，然后作为白色粉末沉淀出来。