機器
business
coal
construction
digger
dirt
employee
energy
engineer
engineering
equipment
excavator
exploitation
extraction
factory
geology
hard
hardhat
heavy
helmet
industrial
job
labor
machinery
male
man
manufacture
mine
miner
mineral
minerals
mining
occupation
ore
people
person
power
production
profession
professional
protection
safety
shaft
technology
tool
underground
uniform
work
worker
working