英语语法分析

Pathological study was carried out on myelocytomatosis of diseased chickens of naturally infected and dominant type, concealed type of ELISA positive and negative control group respectively.

对禽骨髓细胞瘤病显性型病鸡、ELISA阳性的隐性型病鸡和阴性对照鸡进行了病理学研究。