英文關鍵字
metal
iron
spark
steel
equipment
work
factory
industry
tool
manufacturing
machine
production
plasma
light
laser
sheet
manufacture
industrial
cnc
workshop
danger
gas
technology
cut
machining
closeup
hot
welding
action
automated
automatic
automation
engraving
machinery
modern
pattern
design
automobile
blaze
engineering
cutting
computer
digital
energy
cable
burning
console
ignition
internet
sparks