英语语法分析

Natural nidus of Trichobilharzia exists in Huainan area.

淮南地区存在毛毕属吸虫自然疫源地。

Objective To study the effect of Lymnaeidae size on infection of Trichobilharzia living in the Huaihe River system.

目的探讨椎实螺个体大小对淮河水系毛毕吸虫感染的影响。

Objective To investigate species, infection and breeding regulation of the intermediate host of Trichobilharzia in the Huaihe River System.

目的探讨淮河水系毛毕吸虫中间宿主椎实螺种类、感染情况及繁殖节律。