機器
activity
aggregate
background
belt
bite
building
chop
construction
conveyor
crush
crusher
dust
earth
engineering
equipment
excavation
factory
gravel
grind
heavy
industrial
industry
job
landscape
line
machinery
manufacturing
material
metal
mill
mine
mineral
mining
mountain
pit
plant
production
pulverize
quarry
quarrying
rock
sand
sandpit
stone
technology
transportation
work