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rain gutter
agric.	风水沟
desert.	雨水沟; 小冲沟
plast.	雨水口; 排水沟
tech.	雨水排水沟; 檐沟; 天沟
wind.	雨水槽
rain-gutter
gen.	排雨檐槽; 排雨水沟
rain gutters
railw.	雨檐

rain gutter: 5 phrases in 3 subjects

Plastics	3
Rail transport	1
Technology	1