機器
abandoned
aggregate
brick
building
burning
cement
clay
clinker
concrete
construction
dirt
dust
environmental
equipment
fabrication
factory
funnel
furnace
gears
industrial
industry
kiln
kilns
limestone
machinery
manufacture
manufacturing
metal
mill
oven
piling
pipe
plant
pollution
process
produce
production
quarry
raw
refinery
roasting
rotating
rotor
rusty
staving
steel
stove
tube