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自由锻造
avia. open die forging
met. air forging; flat die forging; forge smithing; free forging; hammer forging; open forging; smith forging; open-die forging
tech. flat-die forging
自由锻造无型锻造
nautic., tech. open forging
自 由锻造: 4 phrases in 2 subjects
Metallurgy3
Technology1