機器
function
background
black
circular
construction
device
diligence
disc
drill
electric
electricity
employment
engine
engineering
equipment
factory
fire
fixture
grinder
grinding
hand
heat
hot
industrial
industrial equipment
industry
iron
job
maintenance
manual
manufacturing
melting
metal
metalwork
power
protection
safety
security
sharpening
steel
strength
technology
tool
turning
weld
welding
wheel
work
workshop