英文關鍵字
acetylene
equipment
fire
flame
gas
hot
industrial
industry
man
metal
metalwork
pipe
spark
steel
weld
welder
welding
work
professional
skill
technology
tool
worker
construction
tube
factory
iron
job
manufacturing
production
apparatus
autogenous
closeup
cutting
heat
home
house
melting
oxyacetylene
repair
service
workplace
burner
collar
craftsman
cut
flames