機器
belt
blue
business
construction
conveyor
earth
electric
environment
equipment
extraction
factory
granite
gravel
heap
heavy
hill
industrial
industry
landscape
large
machinery
manufacturing
marble
material
metal
mine
mineral
motor
mountain
nature
pebble
pit
plant
processing
quarry
quarrying
rock
rough
rusty
sand
stone
surface
technology
texture
transport
truck
view
work
working