機器
backhoe
bucket
building
bulldozer
concrete
construction
development
dig
digger
dirt
earth
engineering
equipment
excavate
excavating
excavation
excavator
heavy
hydraulic
industrial
industry
installation
large
lifting
loader
machinery
metal
mine
mover
pipe
pipeline
pipes
power
road
sand
sewer
shovel
site
sky
soil
technology
tractor
trench
truck
tube
vehicle
water
wheel
work