機器
activity
backhoe
bucket
building
business
construction
develop
dig
digger
dirt
dump
earth
earthmover
equipment
excavate
excavation
excavator
expand
gravel
ground
grub
heavy
hill
hydraulic
industrial
industry
load
loader
machinery
mine
mover
outdoor
pit
power
quarry
road
rock
sand
scoop
shovel
site
soil
transport
truck
vehicle
wheel
work
yellow