機器
big
black
bulldozer
commodities
commodity
construction
dig
digger
dirty
dust
emissions
energy
equipment
excavator
front end loader
front loader
fuel
geology
global warming
gravel
gray
grey
heavy
industrial
industrialization
industry
loader
machinery
manganese
mine
mining
open pit
orange
ore
pollution
pollution industry
processing
raw materials
rocks
scoop
shovel
site
smoke
tractor
truck
vehicle
work
yellow