英文關鍵字
casting
closeup
copper
engineering
equipment
factory
heavy
hot
industrial
industry
iron
line
machine
manufacturing
metal
metallurgical
metallurgy
molten
pipe
pipeline
plant
process
product
production
steel
technology
transportation
tube
英文關鍵字
casting
closeup
copper
engineering
equipment
factory
heavy
hot
industrial
industry
iron
line
machine
manufacturing
metal
metallurgical
metallurgy
molten
pipe
pipeline
plant
process
product
production
steel
technology
transportation
tube