機器
asia
black
brown
bucket
building
carbon
chemical
chimney
coal
construction
dig
digger
digging
dirty
earth
energy
environment
equipment
excavation
excavator
factory
fossil
fuel
gas
geology
global
heavy
industrial
industry
land
landscape
loader
machinery
mine
mining
moving
nuclear
open
pit
plant
pollution
power
production
quarry
shovel
sky
smog
smoke
soil
stone
technology
toxic
transportation
truck
vehicle
warming
wheel