機器
background
bucket
bulldozer
deep
dig
digger
dozer
dredge
earth
ecology
environment
equipment
excavate
excavating
excavation
excavator
extreme
formation
geology
glass
gravel
heavy industry
hydraulic
large
layer
manufacturing
mine
mineral
mover
open
ore
pebble
pit
quarry
quarrying
raw
resource
road
rock
rubble
sand
shovel
stone
surface
technology
truck
work