以下为句子列表：
英文: Cost comparisons for desalted water are often made to existing water supplies which did not include a full, fair cost-benefit analysis when the were developed.
中文: 去盐水的价格比较在于现有水的供给状况，此种供给并不一定是全部、公平的价格利益分析，当它们还在发展中。
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英文: In most cases, desalted water is not the sole source of a community's water supply (though this may change as the cost of desalted water goes down); it is usually combined with water from less expensive sources.
中文: 大部分的案例里，去盐的水不是唯一的社区水供给方式(纵使这样可以改变去盐水的价格下降)；它通常结合了较不贵的水资源。
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