ratio of mixture

例句：

1. 1. The teacher explained the concept of ratio to the students.
   老师向学生们解释了比例的概念。
2. 2. The engineer calculated the ratio of materials needed for the project.
   工程师计算了项目所需的材料比例。
3. 3. The doctor determined the patient's blood sugar level based on the ratio of glucose and insulin in their blood.
   医生根据病人血液中葡萄糖和胰岛素的比例来确定病人的血糖水平。