機器
activity
background
backhoe
big
bucket
building
bulldozer
business
coal
construction
dig
digger
digging
dirty
earth
engineering
equipment
excavate
excavating
excavation
excavator
ground
heavy
hydraulic
industrial
industry
large
loader
machinery
maintenance
mine
mining
mover
power
quarry
sand
scoop
shovel
site
soil
technology
tractor
transport
transportation
truck
vehicle
wheel
work
yellow