英文關鍵字
acetylene
aluminium
aluminum
background
billet
black
bright
bullion
cast
casting
commerce
conveyor
equipment
factory
fire
foundry
heavy
hot
industrial
industry
ingot
ingots
iron
labor
lump
machinery
manufacture
manufacturing
material
melt
metal
metallic
metallurgy
plant
pot
process
processing
production
profile
raw
rough
silver
smelt
smelting
steel
stock
substance
technology
warehouse
welder
welding
work
workshop