house sewer connection是什么意思

用法例句

With massive statistic data, the current situation of sewage treatment inGermany is described in this paper, including the rate of piped sewage, and the rate, methodand level of sewage treatment.

本文以大量的统计数据，主要从污水接管率、处理率、污水处理方式、污水处理标准等方面介绍德国污水处理现状，并简单介绍德国污水处理的研究及发展方向。