In the world, more than 30% of schools do not provide safe drinking water for about 570 million children.

在世界上，超过30%的学校无法为大约5.7亿的儿童提供安全的饮用水。

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Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.

那些计划去偏远地区旅行、或在饮用水不现成的国家居住的人，应该知道如何使水适于饮用的各种办法。

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Yet there is a shortage of safe water for drinking and sanitation in many places, not least in the cities to which so many people are now flocking.

ECONOMIST: It must also be clean