機器
bucket
coal
construction
digger
digging
dirt
dirty
earth
energy
engineering
environment
equipment
excavating
excavation
excavator
fuel
geology
gravel
hard
hat
heavy
industrial
industry
job
machinery
male
man
mine
miner
mining
mover
nature
outdoor
people
pit
production
puddle
quarry
removing
safety
sandpit
scoop
smoke
steam
under
wheel
work
worker
yellow