英文關鍵字
arc
bright
closeup
construction
electric
electrode
energy
engineer
engineering
equipment
factory
fire
flame
flash
fuel
gasoline
glove
heavy
helmet
horizontal
industrial
industry
inside
iron
job
labor
man
manufacture
manufacturing
mask
metal
metalwork
occupation
pipe
power
production
protection
safety
skill
smoke
spark
specialist
steel
technology
tool
weld
welder
welding
worker