surface drain 地面排水沟 ; 明沟 ; 表面排水沟
surface water drain 地面水渠 ; 地面排水
system of surface drain 地表排水系统
Surface drain collection systems 地表排水收集系统
There are some systems that actually will take a circle and drop it just below the surface of the water and have the oil kind of flow into it, almost like a drain, recover it and pump it out.
WHITEHOUSE: Daily Press Briefing
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