金属産業
blue
built structure
business
condensation
curves
electricity
energy
environment
fumes
gas
geothermal
geothermal power
geothermic
heat temperature
hot
industrial
industry
metal
pipe
pipe tube
pipeline
pipework
piping
power
power in nature
renewable
responsible business
sky
smokes
stainless
stainless steel
station
steam
steel
structure
sustainable
sustainable resources
technology
thermal
tube
vapor
warm