以下为句子列表：
英文: Chemicals in the factory's sewage system have changed the ecology of the whole area.
中文: 这座工厂排出的化学物质改变了整个地区的生态.
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英文: Similarly, the sewage system is also independent of external services.
中文: 类似的，排水系统也是独立于外部设施的。
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英文: The grave problem of public hygiene is connected with the inefficient sewage system of the city.
中文: 公共卫生方面的严重问题与该城低效率的污水处理系统有关。
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英文: To help tackle the problem of water pollution, we will look to develop options for the further improvement of the strategic sewage system which serves the main urban area.
中文: 为了减少海水污染，我们会研究进一步改良市区策略性污水处理系统的几个方案。
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