機器
vulcanic
chemical
connector
construction
electric
electricity
energy
engineering
environment
facilities
factory
fields
fossils
fuel
gas
gasoline
generation
head
industrial
industry
metal
natural
oil
petrochemical
petroleum
pipe
pipeline
pipelines
plans
pollution
power
production
refinery
sky
stack
station
steam
steel
structure
technology
toxic
triplet
tube
warming
water