機器
big
black
business
check
chunk
coal
construction
deep
digger
discovery
employee
energy
engeneer
engineering
equipment
excavation
excavator
factory
female
geology
heavy
industrial
industry
job
large
lignite
machinery
metal
mine
miner
mineral
mining
open
ore
pit
power
production
quarry
resource
safety
shovel
source
truck
vehicle
woman
work
worker
yellow