機器
action
asphalt
broom
brush
car
city
clean
cleaner
cleanliness
cleanup
closeup
contemporary
day
dirt
dirty
driving
dust
environment
equipment
floor
garbage
industrial
industry
land
machinery
motion
nobody
outdoor
outdoors
part
pavement
road
rubbish
scrub
service
sidewalk
street
sweep
sweeper
sweeping
transport
transportation
truck
urban
vehicle
wash
wheel
work
working