英文關鍵字
air
blue
business
chemical
chimney
construction
energy
engineering
environment
equipment
factory
fossil
fuel
gas
gasoline
heavy
industrial
industry
line
manufacturing
metal
natural
oil
petrochemical
petrol
petroleum
pipe
pipeline
piping
plant
pollution
power
processing
production
pump
refinery
silver
sky
smoke
station
steel
storage
structure
system
tank
technology
tower
tube
valve
white