英文關鍵字
arc
argon
background
beam
clip
craftsman
dangerous
employee
engineering
factory
fire
flash
frame
gas
gloves
helmet
industrial
labor
laboratory
man
manual
manufacture
mask
metallic
oxygen
part
party
plant
power
processing
producing
product
professional
protective
smoke
spark
splash
steel
technical
technician
technology
together
torch
unique
welder
welding
working
workshop