機器
asphalt
build
bulldozer
canalization
channel
city
city street
collector
concrete
construction
construction worker
development
dig
dirty
drain
earth
equipment
excavation
excavator
ground
heavy
highway
hole
industrial
industry
infrastructure
machinery
maintenance
metal
middle
pipe
repair
road
road excavator
service
sewage
sewer
shoveling
site
soil
steel
street
transportation
tube
urban
water
work
workplace
yellow