機器
activity
background
belt
business
carry
cobblestone
concrete
construction
conveyor
crushed
crusher
earth
emptying
engineering
environment
equipment
excavation
extraction
factory
gravel
heap
heavy
industrial
industry
large
limestone
line
loading
machinery
manufacturing
material
metal
mine
mineral
outdoor
pebble
process
production
quarry
raw
rock
stone
stones
tape
technology
transport
transportation
unload
work