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BBC媒体英语新闻:Special book makes water drinkable 巧用书本过滤饮用水(mp3下载)

cocotang 于2015-09-29发布 l 已有人浏览
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BBC媒体英语新闻:巧用书本过滤饮用水,含有新闻文本及mp3免费下载。
    小E英语欢迎您,请点击播放按钮开始播放……

More than 600 million people around the world lack access to clean drinking water and this book has the potential to help.

It's relatively cheap, easy to ship and its pages serve two purposes: firstly, they are printed with instructions on how and why water should be filtered; secondly, they can be torn out and used as filters.

The paper contains nanoparticles of copper or silver, which kill bacteria and the new trial results from water sources in South Africa, Ghana and Bangladesh confirm that on average the paper slashes the bacteria count of contaminated water by well over 99%.

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