英语词汇gravity sewerage system怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	gravity sewerage system
释义	gravity sewerage system 简明释义重力式下水系统网络释义 1 ?重力式下水系统重力式下水系统双语例句 1 The main topics such as the sewerage system selection, design principles, sewerage network layout, pumping station layout, design of pressure pipe and gravity pipe. 重点阐述在管网布置时，应考虑地形及地质情况，优选重力流排水以节能，并且要兼顾考虑泵站的设置数量及管网建设的经济合理性；
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