positive comparison的用法和樣例：
例句
- Perform a growth promotion test as a positive control.
進(jìn)行一個(gè)生長(cháng)促進(jìn)試驗作為陽(yáng)性對照。 - In histological examination of spleen, germinal centers were not observed in the positive control group, but were observed in the sample group.
陽(yáng)性對照組脾臟病理表現為脾小體的生發(fā)中心消失，醫用熱硫化硅橡膠組變化不明顯。
