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质，我们生命的一大部分。 　　真正的缺水，不是没有水，而是明明有水却不能饮用；真正的缺水，不是明明有水却不能饮用，而是明明可以饮用的水越来越少，却不懂得...

ls and boys who smoked was about equal in half the 151 countries surveyed. This ...

of a container. When it is a gas, you cannot see or feel it. 　　Although abou...