sewage

sewage ^{n. [U] the mixture of waste from the human body and used water that is carried away from houses by pipes under the ground（下水道里的）污水，污物}

• Proper sewage disposal is essential to prevent the contamination of local groundwater. ^{妥善的污水处置对于防止当地地下水受到污染至关重要。}
• The city is investing in a new sewage treatment plant to improve water quality. ^{该市正投资建设一座新的污水处理厂以改善水质。}

sewer ^{n. [C] a pipe or passage under the ground that carries away waste material and used water from houses, factories etc. 下水道}

• He must have been familiar with the enormous madrepore of the sewer. ^{他必须清楚这个巨大珊瑚形阴渠。}
• The most surprising rencounter was at the entrance to the Grand Sewer. ^{最令人吃惊的意外发现是在大阴渠的进口处。}
• The sewer in the kitchen clogs easily. ^{厨房的下水道很容易堵塞。}

drain ^{n. 1. (Br. E.) [C] 下水道，地沟；2. (Am.E.) [C]（卫生间或水池的）排水口}

• On his way to the sweet shop, he dropped his fifty pence and it bounced along the pavement and then disappeared down a drain.
• George took off his jacket, rolled up his sleeves and pushed his right arm through the drain cover.

drainage ^{n. [U] 排水}

• The city was even equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.