機器
building
business
chemical
chemistry
clear sky
color
complex
copy space
distillery
energy
engine
engineering
environment
environmental
equipment
facility
factory
fire
gas
gasoline
heavy
high
industrial
industry
landscape
machinery
metal
oil
petrochemical
petroleum
pipe
pipeline
piping
plant
pollution
power
production
protection
refinery
silver
station
steel
structure
tanks
technology
tower
tube