英文關鍵字
construction
flash
metal
protection
welder
arc
electric
equipment
iron
pipe
protective
safety
spark
steel
welding
work
worker
fire
man
tool
weld
workshop
aluminium
bright
detail
flame
gas
industrial
industry
manual
torch
hand
hot
skill
fabricate
labor
light
structure
color
craftsperson
electrode
energy
fabricator
hands
heat
inert
locksmith
machine
method
natural