It is universally acknowledged that the problem of removing waste materials from big cities will not be solved until people find

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问题 It is universally acknowledged that the problem of removing waste materials from big cities will not be solved until people find means of making use of these materials.

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答案直到人们找到利用废弃材料的方法,大城市废物清理的问题才能得以解决,这是被普遍认可的。

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