機器
air
belt
business
construction
conveyor
copy
crane
digging
drag
environment
equipment
excavate
excavation
excavator
extraction
factory
gravel
heap
heavy
industrial
industry
line
loader
loading
machinery
manufacturing
material
mine
mineral
motor
natural
nature
open
ore
outdoors
pile
pit
plant
production
quarry
refinery
saline
salt
salty
sand
shovel
site
sodium
space
stack
stone
transport
transportation
white
work