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covered drain
agric. 暗沟
bridg.constr. 暗渠
hydroel.st. 暗沟; 阴沟
tech. 地下排水; 暗排水沟
water.res. 排水暗沟
covered drains
hydraul. 覆盖排水管
covered drain
: 10 phrases in 5 subjects
Bridge construction1
Construction1
Hydrology1
Rail transport2
Technology5