機器
big
cast
coal
construction
dig
digger
digging
dirt
earth
energy
engineering
environment
equipment
excavate
excavation
excavator
exploitation
geology
gravel
ground
heavy
industrial
industry
landscape
large
limestone
machinery
metal
mine
mineral
mining
nature
open
ore
pit
power
production
quarry
resource
rock
sand
site
stone
surface
technology
truck
vehicle
wheel
work