排水
名词 drainage
动词 drain
动词短语 drain off water
动词短语drain away water
[例句]他安装了雨水檐沟和排水管。
He installed rain gutters and downspouts.
排水管
[词典] drainpipe; drain-pipe; pipe weep; exhaust water pipe; fall tube;
[例句]他安装了雨水檐沟和排水管。
He installed rain gutters and downspouts.
pipeline
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