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。
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。
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