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sewer; sewer system; sewerage; drain
下水道の工事で道路が通行止めだ。
The road is closed due to sewer construction.
古い下水道を新しく敷設し直した。
The old sewers were newly relaid.
下水道の整備が都市の発展に欠かせない。
Sewer system development is essential for urban growth.