機器
asphalt
broom
brush
business
car
city
clean
cleaner
cleanliness
cleanup
collector
day
detail
dirt
dirty
driving
dust
environment
equipment
floor
garbage
industrial
industry
machinery
modern
motion
municipal
orange
outdoor
pavement
road
rotating
rubbish
service
sidewalk
street
sweep
sweeper
sweeping
transportation
truck
urban
vacuum
vehicle
wash
waste
wheel
work
yellow