機器
boiler
building
chemical
clean
device
ecology
electric
electricity
energy
engine
engineering
equipment
facility
factory
fuel
fume
generation
heat
heavy
indoor
industrial
industry
line
manufacturing
metal
modern
pan
panorama
pipe
pipeline
plant
pollution
power
production
smoke
snow
stainless
station
steel
supply
system
tank
technical
thermal
tube
turbine
winter
wire