燃やす
aged
architecture
blast
blast furnace
blue
building
chimney
clouds
coal
coke
construction
duisburg
energy
environment
equipment
exterior
factory
fireplace
furnace
heavy
high
industrial
industry
iron
ironmaking
manufacturing
metal
metallurgical
metallurgy
old
oven
plant
pollution
power
process
production
rust
scenery
sky
smoke
steel
steelworks
technology
tower
tubing
work