機器
canyon
chalk
chalkquarry
construct
construction
day
deposit
development
dig
dirt
dragline
earth
earthmover
environmental
equipment
excavation
excavator
expand
extract
geology
gravel
ground
heavy
industrial
industry
landscape
large
machinery
mine
mineral
mining
mountain
natural
open
ore
pile
pit
quarry
resource
rock
shovel
soil
stone
summer
tranquil
vehicle
work