污水處理
A process which makes sewage less harmful to the environment before it is discharged into the sea (Book 1, p.162)
污水被排放至大海前，減低它對環境的有害影響的過程。
Pronunciation in English (listen with default application).
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Sewage treatment
污水處理 污水被排放至大海前，減低它對環境的有害影響的過程。
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