英文關鍵字
arc
artisan
assembly
close
connection
construction
craftsmanship
elec
electrode
electrodes
engineering
equipment
establishes
factory
fire
flash
gas
hand
heat
ignite
industrial
industry
iron
light
locksmithing
man
manual
manufacturing
metal
production
products
protection
repair
safety
seam
smoke
spark
stainless
steel
structure
technical
technology
training
weld
welder
welding
work
worker
workplace
workshop