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区域精炼
gen. zone; zoning
met. zone refine; zone refining; zone melting
tech. zone purification; zone-refine; zone refining (法)
区域〔逐区〕精炼
gen. zone-refine
区域〔区熔,带熔〕精炼
el. zone refine
区域精炼: 70 phrases in 4 subjects
General1
Metallurgy65
Shipbuilding1
Technology3