機器
breakstone
coal
construction
conveyor
dirt
dredger
dust
earth
engineering
environment
equipment
excavation
excavator
extraction
factory
fuel
geology
granite
gravel
grunge
hard
heap
heavy
huge
industrial
industry
land
loader
material
mechanical
mine
mineral
nobody
pit
plant
production
quarry
rock
rough
rubble
sand
sorting
stone
storage
surface
tool
transport
transportation
work