英文關鍵字
acetylene
arc
closeup
construction
cutting
dangerous
engineering
equipment
factory
fire
flame
flash
flying
gas
gloves
heat
industrial
industry
iron
labor
light
man
manufacture
manufacturing
mask
metal
metalwork
motion
occupation
pipe
production
protection
repair
safety
shiny
slow
smoke
solder
spark
sparks
steel
technology
tool
torch
weld
welder
welding
work
worker
workshop