英语语法分析

This paper studied the toxicity effect of Ni, Hg and PCP on Chironomus Larva.

本文研究了镍、汞和五氯酚对摇蚊幼虫的毒性作用。

The biomass was mainly contributed by Corbicula largillierti, Radix sp. , and Chironomus sp.

生物量优势种为刻纹蚬、萝卜螺和摇蚊。

The effective removal of Chironomus larva (red worm) from drinking water in conventional water treatment process has become one of the problems that puzzle the normal operation in water works.

摇蚊幼虫（红虫）难以被常规的水处理工艺有效地去除，成为困扰水厂正常生产运行的问题。