英文關鍵字
blue
business
chemical
conduit
construction
energy
engineering
environment
equipment
factory
field
fossil
fuel
gas
gasoline
generation
industrial
industry
line
metal
natural
nobody
oil
oilfield
petrochemical
petrol
petroleum
pipe
pipeline
plant
pollution
power
production
pump
refinery
rig
sky
station
steam
steel
storage
sun
sunset
supply
tank
technology
tower
tube
valve
water