class grouping

• 分级

class grouping的用法和样例：

例句

1. There was no significant difference in different Child-Pugh class of cirrhosis.
   不同肝功能分级的肝硬化患者间血清瘦素水平差异不显著。
2. Complications and survival were analyzed, and postoperative changes in RV function and functional class were evaluated.
   分析手术并发症及生存率，评估术后右室功能改变及功能分级。