機器
asphalt
auto
automobile
car
city
clean
cleaner
cleanup
day
dirt
dirty
driving
dust
equipment
floor
flow
industry
machinery
modern
motion
orange
outdoor
pavement
power
road
roadway
service
special
splash
spray
stream
street
summer
sweep
sweeper
tank
technology
transport
transportation
truck
urban
vehicle
wash
water
wet
work