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自來水是從哪裡來的,要到哪裡去?這本書介紹了原水從江河進到取水口,經由淨水過程後,再沿著長長的水管到住家,再重返江河的水漫長的旅行。我們經常使用的水需要許多人幫忙才能取得,透過本書讓兒童認知珍惜水資源。