機器
bucket
bulldozer
construction
construction site
dig
digger
digging
dirt
earth
engineering
equipment
excavation
excavator
geology
gold
gravel
heavy
hole
industrial
industry
iron
land
loader
machinery
metal
mine
mineral
mining
mover
open
ore
pit
power
quarry
river
road
sand
scoop
shovel
site
soil
stone
technology
transport
truck
vehicle