英文關鍵字
bright
busy
construction
electrodes
engineering
equipment
fabricator
factory
flame
heat
hot
industry
iron
light
man
manufacturing
mechanical
melt
metal
metalwork
production
protection
safety
sparks
steel
technology
welder
welding
work
worker
英文關鍵字
bright
busy
construction
electrodes
engineering
equipment
fabricator
factory
flame
heat
hot
industry
iron
light
man
manufacturing
mechanical
melt
metal
metalwork
production
protection
safety
sparks
steel
technology
welder
welding
work
worker