英文關鍵字
sheet
metal
machines
blacksmith
process
metalworking
metallurgy
cutting
modern
energy
spark
burn
line
worker
manual
plasma
cutter
construction
welding
machine
industrial
heat
technology
sparks
workshop
processing
precision
light
laser
iron
tool
manufacturing
engineering
cut
cnc
automated
steel
production
metalwork
machinery
equipment
industry
factory
strict
special
safe
gloves
work
concept:
welder