英文關鍵字
acetylene
air
bright
burn
construction
cut
cutting
dangerous
engineering
equipment
factory
fire
flame
footage
full
gas
glow
hd
heat
hot
industrial
industry
iron
job
labor
light
machinist
manual
manufacture
manufacturing
metal
metallurgy
occupation
oxygen
pipe
plasma
plate
profession
protection
repair
safety
skill
smoke
spark
steel
technology
tool
torch
video
welder
welding
work