英文關鍵字
aluminum
automatic
bright
burning
casting
construction
conveyer
copper
dark
dirty
effort
enviroment
equipment
factory
fire
flame
flowing
foundry
fumes
furnace
glowing
gold
heat
heavy
industry
iron
liquid
macro
manufacturing
material
melting
metal
metallurgy
mill
molten
objects
occupation
overweight
pollution
pouring
power
red
smoke
sparks
steel
technology
tongs
toughness
vat
working