機器
background
black
business
charcoal
coal
crane
dig
digger
dirty
ecology
energy
environment
equipment
excavator
extraction
factory
fossil
fuel
geology
heat
heavy
huge
industrial
industry
large
lignite
loader
machinery
manufacturing
material
mine
miner
mineral
nature
open
ore
pile
pit
power
production
quarry
rock
stone
transport
transportation
truck
vehicle
work
yellow