英文關鍵字
arc
black
blue
bright
burning
construction
craftsman
dark
engineering
equipment
fabrication
fabricator
face
factory
foreman
horizontal
industrial
industry
iron
light
manual
manufacturing
metal
metalwork
mig
obscured
occupation
onsite
orange
oxyacetylene
person
pipe
red
repairing
safety
skilled
sparks
steel
tool
torch
trade
vertical
welder
welding
worker
working
workshop