以下为句子列表：
英文: Treating water is a hugely water-intensive process, and the commonly used systems cannot be sustainable expanded to serve the three billion people now without access to sewage treatment.
中文: 处理污水是个巨大的水强化过程，且一般的使用系统并不能持续地扩大到服务三十亿人口，他们现在并没有进行污水处理。
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