機器
alternative
blue
business
chemical
chemistry
design
ecology
energy
engineering
environment
equipment
factory
fuel
gas
gasoline
heat
heavy
high
industrial
industry
installation
iron
liquid
manufacture
metal
modern
natural
oil
petrol
petroleum
pipe
plant
pollution
power
pressure
process
production
refinery
sky
skyline
smoke
steel
supply
technology
top
tower
tube
white
work