英语语法分析

No schistosome antigen could be found on frozen sections of kidneys by indirect fluorescent test.

用间接荧光抗体试验在肾切片上耒发现日本血吸虫抗原。

The researchers found that an increase in the length of time environmental conditions were ideal for the growth of both the Oncomelania snail and the Schistosome worm.

研究人员发现适宜于钉螺和血吸虫生长的时期在过去几十年中有不同程度的延长。