英语语法分析

Gravity valveless filter has been widely used in the practice.

重力式无阀滤池广泛应用于生产中。

The operating principle and flow characteristic of micro valveless pump were introduced.

介绍了无阀型微泵的特点及其工作原理；

The surface water treatment systems without clarifying basin and Valveless Filter Base were introduced.

介绍了以地表水为水源的水处理系统设计中，不设计澄清池与无阀滤池的另类系统。