機器
backhoe
big
bucket
bulldozer
business
construction
crawler
crushing
development
digger
digging
dredge
earth
equipment
excavation
excavator
extraction
geology
gravel
heavy
huge
hydraulic
industrial
industry
iron ore
large
loader
machinery
manufacturing
material
mine
miner
mineral
mining
mountain
quarry
quarrying
resource
rock
scoop
shovel
shoveling
stone
technology
transport
transportation
vehicle
work
working