地下管廊本来有收益来源，比如自来水等。统一的地下管廊可以大大节约排污、

地下管廊本来有收益来源，比如自来水等。统一的地下管廊可以大大节约排污、供水的成本，污水处理费、自来水费就有降价的空间，市民就可以少缴一些费用。降低居民的成本

結果 (英文) 1:

Underground pipe Gallery had income sources, such as tap water, etc. Unified underground pipe Gallery can greatly reduce the cost of sewage disposal, water supply, sewage charges, water charges will have room for the price, people will pay a little less cost. Reduce the costs of residents

結果 (英文) 3:

Underground pipe gallery would have revenue sources, such as water, etc.. Unified underground pipe gallery can greatly save the cost of sewage, water supply, sewage treatment fees, water charges there is room for price cuts, the public can pay a few fees. Reduce the cost of residents