... 塑料填料 pastic media 污水自然处理 natural treatment of wastewater 土地处理 land treatment ...
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The site's natural resource recovery systems, developed by the local people, have saved the city of Kolkata from the costs of constructing and maintaining wastewater treatment plants.
此地由地方群众开发的自然资源恢复系统把科卡塔市从建设和维护废水处理装置的大量花费中解救了出来。
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