functional retention index

例句：

1. 1. The functional retention index of thenew drug is significantly higher than that ofthe old one.
   新药的功能性保留指数明显高于旧药。
2. 2. The functional retention indexof the soil was determined using a laboratorytest.
   土壤的功能性保留指数通过实验室测试确定。
3. 3. The functional retention index of thenew material was found to be superior tothat of the existing one.
   新材料的功能性保留指数优于现有材料。