同时建议污水收集系统先行；
The drainage system should be built ahead of the Wastewater treatment plant.
阐述了污水收集系统的规划原则和本区管网布置特点。
The planning principles of the sewage collection system and the characteristics of sewer network layout are also introduced.
此外，又在新界乡村地区施行乡村污水收集系统改善计划。
Village sewage improvement schemes have also been carried out in the rural areas of the New Territories.
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