機器
air
air conditioning
chrome
clean
cleaner
cleanliness
cleanup equipment
dirt
dirty
dust
electricity
equipment
exhaust
fresh vacuum
freshness
glass
housework
labor
louvers
metal
metallic wall slot suction
modern
neat
object
performance
precision
reflection
round
service
suck
technology
tool
ventilation
ventilation shaft
ventilation systems
vents
washing machine