yellow precipitate

例句：

1. 1. The yellow precipitate in the test tube is a sign of the presence of hydrogen ions.
   试管中的黄色沉淀物是氢离子存在的标志。
2. 2.The chemical reaction produces a yellow precipitate that can be easily dissolved in water.
   化学反应产生的黄色沉淀物很容易在水中溶解。
3. 3. The doctor used a yellow precipitate to identify the presence of bilirubin in the patient's urine.
   医生使用黄色沉淀物来鉴定病人尿液中是否存在胆红素。