機器
alloy
ball
balls
bearing
belt
blast
cast
casting
circle
conveyor
cooling
elevator
equipment
factory
forging
foundry
furnace
globe
grinding
heat
heavy
hot
industrial
industry
iron
line
machinery
manufacture
manufacturing
material
mechanism
melt
melting
metal
metallurgical
metallurgy
mill
orange
plant
process
production
red
rollers
rolling
smelting
sphere
steel
stove
workshop