appurtenant works meaning in Chinese

辅助工程
附属工程

With the rapid development of urban construction , the protection of water environment is more and more important and the waste water treatment establishment has been gradually completed . and it brings a lot of data of sewage pipe network and appurtenant works
目前我国城市建设发展迅速，城市水体保护越来越受到重视，相应的污水处理设施也越来越完善，污水管网及其附属设施的信息量越来越大。