英文關鍵字
alloy
automated
blast
boiling
burner
casting
closeup
ductile
engineering
factory
fire
flame
foundry
fuel
furnace
heat
heavy
hot
industrial
industry
intense
iron
ladle
lathe
manufacture
manufacturing
material
melt
metal
metallurgy
mill
molten
orange
plant
pot
power
production
red
smelting
steel
stove
technical
technology
temperature
transport
yellow