饮用水何时才能够安全饮用？来源：TED-Ed翻译：柚子木字幕组长度：

水是人类的生命之源，很多地区，饮用水处短缺或者水质污染，下面乱码给大家做一个科普，饮用水何时才能安全饮用？

(友情提示：视频很短，可以在4G环境下欣赏。）

来源：TED-Ed | 视频长度：05：24

翻译：柚子木字幕组

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