機器
big
bucket
bulldozer
clay
construction
dig
digger
dump
earth
environment
equipment
excavation
excavator
geology
gravel
heavy
hydraulic
industrial
industry
iron
large
limestone
loader
machinery
metal
mine
mining
mover
open
opencast
ore
pit
power
quarry
quarrying
road
rock
sand
shovel
site
sky
soil
stone
transportation
truck
vehicle
wheel
work
yellow