we will not run out of usable water because waste water can be purified through a special process
题目
we will not run out of usable water because waste water can be purified through a special process
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答案
If waste water could not be purified through a special process,we would run out of usable water.
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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