Page 1
When we turn on a tap, clean water seems to appear almost instantly.
当我们拧开水龙头时，干净的水好像一下子就出现了。正文预览
Page 2
But tap water has already traveled through a long system before it reaches the sink.
可实际上，自来水在到达水槽之前，已经经过了一整套很长的系统。
Page 3
Water usually begins in rivers, lakes, reservoirs, or underground sources that a city can collect from.
城市使用的水，通常来自河流、湖泊、水库，或者地下水等可以被收集的水源。
Page 4
At a treatment plant, the water is cleaned step by step to remove dirt, tiny particles, and harmful microbes.
在水厂里，水会一步步接受净化处理，把泥沙、细小杂质和有害微生物尽量去除。
Page 5
Workers test the water quality carefully, because clean-looking water is not enough if it is not truly safe.
工作人员会认真检测水质，因为看起来清澈的水，并不一定就已经足够安全。
