sewered

The old town was finally sewered last year, so the streets no longer flood after heavy rain.

用法提示：这里的 sewered 是 sewer 的过去分词，用于被动语态表示被铺设下水道。

Once the new district is sewered, the housing development can be approved.

用法提示：sewered 是过去分词，在从句中作被动结构的一部分，表示完成铺设下水道。

The city has sewered the area to prevent pollution from leaking into the river.

用法提示：sewered 是现在完成时中的过去分词，与 has 搭配表示已完成的排水设施建设。