機器
asphalt
auger
background
blue
borer
buldozer
bulldozer
business
cable
clay
construction
danger
digger
digging
dirt
ditch
drill
drilling
earth
equipment
excavate
excavating
excavation
excavator
fiber
field
flood
gas
heavy
hole
industrial
isolated
landscape
natural
nature
newroad
road
soil
spreading
transportation
travel
tree
truck
water
widening
work
yellow