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学校组织了一个field trip，去保护区公园参观一个展览，关于大多伦多地区的水处理系统是如何运作的。每个家庭每个用水的地方都有两个管道，一个负责送来清洁的水，一个负责送走用过的脏水。清洁的水来自......用过的水会被送到......
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