positive comparison

• 阳性对照

positive comparison的用法和样例：

例句

1. Perform a growth promotion test as a positive control.
   进行一个生长促进试验作为阳性对照。
2. In histological examination of spleen, germinal centers were not observed in the positive control group, but were observed in the sample group.
   阳性对照组脾脏病理表现为脾小体的生发中心消失，医用热硫化硅橡胶组变化不明显。