英文關鍵字
alloy
bright
burning
color
concepts
effort
factory
fire
flame
flowing
foundry
furnace
glowing
gold
golden
heap
heat
incentive
industrial
industry
ingot
iron
kiln
liquid
manufacturing
melting
metal
metallurgist
metallurgy
mining
molten
ore
plunge
red
smoke
sparks
steel
stream
technology
temperature