機器
asphalt
broom
car
city
clarity
clean
cleaner
collector
detail
dirt
dirty
driving
dust
engineering
environment
equipment
flow
garbage
highway
mechanism
motion
order
pavement
purity
road
rotate
rubbish
service
shower
sprinkler
sprinkling
stream
street
sweep
sweeper
technical
town
transport
truck
turn
urban
vehicle
wash
waste
water
way
wheel
work