機器
asphalt
avenue
body of water
boulevard
bridge
broom
brush
brushing
city
clean
cleaner
cleaning service
cleanliness
dirt
dirty
dust
environment
equipment
garbage
highway
industrial
industry
landscape
machinery
motion
municipal
municipal service
orange
outdoor
river
road
road service
rubbish
service
special
spring
street
street cleaning
sweep
sweeper
sweeper machine
sweeping
technique
transport
truck
urban
vehicle
work
working