I have cities but no houses, forests but no trees; rivers but without water; what am I?
我有城市但没有住宅，有森林但没有树木，有河流但没有水，我是什麽?。
We can't live without water, but now many rivers are polluted.
没有水我们不能生存，但是现在许多河流被污染。
We can't live without water but now many rivers are polluted.
没有水我们不能生存，可是此时许多河流被污染。
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