indicarminum

例句：

1. 1.The doctor used a blood test to check for the presence of glucose in the patient's blood.
   医生使用血液测试检查患者血液中葡萄糖的存在。
2. 2. The chemical was used as an indicator of acidity in wine.
   这种化学物质被用作葡萄酒酸度的指示剂。
3. 3.The scientist used a spectrophotometer to measure the concentration of the substance in the sample.
   科学家使用分光光度计测量样本中物质的浓度。