1. We shall have to dig under the river to lay the sewage pipe. 为了铺设污水管道,我们必须在河床下面开一条通道。
2. Oxidation ditch technology and its application in the treatment of sewage are summarized. 概述了氧化沟工艺及它在污水处理中的应用情况。
3. The constructed wetland is an ecological sewage treatment with good purification effects and low construction and operation costs. 人工湿地是一项水质净化效果好,建造、运行费用低的生态污水处理技术。
英英解释
n.
1. waste matter carried away in sewers or drains