该指数通过观察2004-2008年的18项环境指标评估112座城市的可持续性，这些指标包括空气污染、污水回收利用、公共交通等。
The index assessed sustainability in 112 cities by looking at 18 environmental indicators — from air pollution to waste recycling to mass transit — for the years 2004-2008.
得到的液体可以被生态系统回收利用，比如可以将其回收至墓地、森林或是直接排入城市污水系统。
The liquid can be recycled back to the ecosystem by being applied to a memorial garden or forest or simply put into the sewerage system.
在许多大型养殖场中，沙子都是从散栏畜舍中“循环利用”进入排水沟或巷道，跟污水一起被运送到回收系统，然后重新用到散栏畜舍。
In many large farms, the sand is "recycled" from the free stall, into the gutter or alley, carried by water to a recovery system, and then reapplied to the free stall.
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