The problem of municipal sewage disposal is complicated by the fact that, years ago, most cities combined their storm and waste disposal sewers.
城市排水问题复杂化了，依据事实是几年前城市合并了他们的暴雨和污水处理系统。
2
The utility model is a water grating board which is convenient to drain. The utility belongs to water grating used in municipal works and sewers of streets and dwelling communities.