機器
activity
aggregate
background
belt
bite
building
chop
construction
conveyor
crush
crusher
dig
digger
dust
earth
engineering
equipment
excavation
excavator
factory
gravel
grind
heavy
industrial
industry
job
landscape
machinery
manufacturing
material
metal
mill
mince
mine
mineral
mountain
pit
plant
pound away
pulverize
quarry
rock
sand
site
sting
stone
technology
transportation
work