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清底
bridg.constr. base cleaning; bottom cleaning
tech. bottoming; cleaning of bottom
清底
: 81 phrases in 20 subjects
Agriculture1
Architecture1
Automobiles7
Bridge construction4
Chemistry1
China1
Commerce1
Drilling5
Earth sciences1
Economy1
Engineering geology1
Explosives and Explosive Ordnance Disposal2
General4
Hydroelectric power stations1
International trade1
Metallurgy1
Navigation1
Oil / petroleum6
Rail transport2
Technology39