英文關鍵字
arc
auto
automotive
black
blacksmith
career
closeup
components
dirty
electric
engineering
equipment
factory
falling
fire
flame
flash
floor
gas
ground
heat
hot
industrial
industry
labor
machine
manufacture
manufacturing
mechanic
mechanical
metal
metalwork
metalworking
modify
occupation
part
plant
production
repair
sparkles
sparks
steel
stick
tube
view
welder
welding
working
workplace
workshop