英文關鍵字
asphalt
brush
car
city
clean
cleaner
cleaning
cleanliness
cleanup
dirt
dirty
driving
dust
environment
equipment
floor
garbage
industrial
industry
lights
machine
machinery
motion
night
outdoor
road
rubbish
service
splashing
stream
street
sweep
sweeper
sweeping
technology
truck
urban
vehicle
wash
water
work