This street is the first in the city to have an underground sewer system.

这条街是本市第一条有下水道系统的街。

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Before you know it, the the city water and sewer system will stop working.

你知道它之前，城市供水和污水处理系统将停止工作。

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Before you know it, the the city water and sewer system will stop working.

你知道它之前，城市供水和污水处理系统将停止工作。

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