英语语法分析

At each stage of development the trematode encounters formidable hazards.

吸虫在发育的每一个阶段，都可能遭遇到极大的风险。

For cases of mixed infection of cestode or trematode praziquantel was used.

发现绦虫和吸虫感染者用吡喹酮驱治。

Schistosomiasis, or bilharzia, is a parasitic disease caused by trematode flatworms of the genus Schistosoma.

血吸虫病（又称裂体吸虫病）是由裂体吸虫属血吸虫引起的一种寄生虫病。