機器
big
black
brown
capacity
carbon
coal
coal field
coal industry
crane
cut
dig
digger
digging
earth
energy
engine
equipment
excavation
excavator
exploitation
extract
extraction
fossil
fuel
geology
giant
gravel
ground
heavy
huge
industrial
industry
large
lignite
load
loader
machinery
mine
open
pit
power
production
quarry
soil
stack
technology
transportation
view
wheel