它使污水的营养物质回馈到农作物，且使污水不致受到受污染的水道的影响。
It makes use of the nutrients in sewage to feed crops and keeps them from polluting waterways.
里约在2009年申请承办夏季奥运会时，承诺会清理受污染的水道并将80%的家庭纳入下水道系统中。
When Rio made its bid to host the Summer Games back in 2009, it promised to clean up the polluted waterways and connect 80% of homes to the sewage system.
每年，数以百万计的塑料瓶被丢弃，污染了土地和水道。
Every year, millions of plastic bottles are thrown away, polluting the land and waterways.
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