staining agent

例句：

1. 1. The stain on the shirt is due to the acid in the dishwashing liquid.
   衬衫上的污渍是由于洗碗液中的酸造成的。
2. 2. The scientist used a staining agent to reveal the structure of the bone.
   科学家使用染色剂来揭示骨骼的结构。
3. 3. The teacher asked the students to identify the different types of stains using different staining agents.
   老师要求学生们使用不同的染色剂来识别不同类型的污渍。