機器
activity
asphalt
black
canal
construction
dirt
dirty
earthworks
equipment
excavating
excavation
excavator
grooving
industrial
industry
infrastructure
installation
line
machinery
main
maintenance
new
old
open
outdoor
outdoors
outside
pipe
pipeline
pit
plastic
plot
plumbing
power
protective
repair
round
route
sand
shovel
site
system
technology
track
underground
urban
work
worker
yellow