英文關鍵字
acetylene
autogenous
building
closeup
construction
cut
cutter
cutting
dangerous
energy
equipment
factory
fire
flame
fuel
gas
goggles
industrial
industry
iron
laborer
light
man
metal
metalwork
oxyfuel
pipe
protection
safety
site
spark
sparkle
steel
technology
torch
tube
uniform
welder
welding
work
worker