城市污水集中土地处理所采用的技术目前已经比较成熟，存在的问题是占地面积太大。
The techniques used for disposing of city wastewater have been mature, but the problem is that the covered land is too large.
城市污水集中土地处理所采用的技术目前已经比较成熟，存在的问题是占地面积太大。
The techniques used for disposing of city wastewater have been mature, but the problem is that the covered land is too large.
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