In most large cities around the globe, sewage and wastewater gets processed at a treatment plant.
地球上大多数大城市，污水和废水都在水处理厂处理。
Today in most large cities, water is used only once and then sent out into a sewer system.
今天在大多数的大城市里，水仅仅被用过一次，之后就被送到了下水道。
Today, in most large cities, water is used only once and then discharged into a sewer system.
今天，在大多数大城市，水是仅使用一次，然后排入下水道系统。
Most large cities have zoos, but have you ever been to a zoo at night?
多数大城市都有动物园，但你有过晚上去动物园的经历么？
Most large cities have zoos, but have you ever been to a zoo at night?
大多数大城市都有动物园，但是你曾经在晚上去过动物园吗？
Most large cities, such as Liverpool and New York, have had experience of this kind, with old factories turned into successful arts centers.
许多大都市，像利物浦和纽约都有类似的经验，把旧工厂改造成成功的艺术中心。
Most large cities, such as Liverpool and New York, have had experience of this kind, with old factories turned into successful arts centers.
许多大都市，像利物浦和纽约都有类似的经验，把旧工厂改造成成功的艺术中心。
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