機器
activity
aggregate
bucket
bulldozer
construction
cut
dig
digger
dust
earth
equipment
excavate
excavation
excavator
extraction
geology
granite
gravel
ground
heavy
huge
industrial
industry
limestone
machinery
marble
material
mechanism
mine
mineral
mountain
mover
outdoor
pile
pit
power
quarry
resource
rock
shovel
stone
technology
transport
transportation
truck
vehicle
work