英文關鍵字
construction
electric
engineering
factory
fire
industrial
industry
iron
job
light
machine
manufacture
manufacturing
metal
production
protection
smoke
spark
sparks
steel
structure
technical
technology
welding
work
worker
英文關鍵字
construction
electric
engineering
factory
fire
industrial
industry
iron
job
light
machine
manufacture
manufacturing
metal
production
protection
smoke
spark
sparks
steel
structure
technical
technology
welding
work
worker