機器
action
asphalt
broom
brush
business
car
city
clean
cleaner
cleaning
cleanliness
cleanup
day
dirt
dirty
driving
dust
environment
equipment
garbage
industrial
industry
land
machinery
motion
municipal
orange
outdoor
outdoors
pavement
road
rubbish
scrub
service
sidewalk
street
sweep
sweeper
sweeping
technology
transportation
truck
urban
vehicle
wash
waste
water
wheel
work