differential recovery rate的用法和样例：
- The average recovery rate is 98% to add tetramine into the samples.
- Results:every group bacetrium recovery rate:ou higher than70%.
- The mean recovery rate was 103% and the CV was 4.3%.
- The recovery rate of the treatment with azithromycin was 70%.
- The average recovery rate of MgSO4 was 99.3% with RSD of 0.66%.