英文關鍵字
metal
technology
steel
processing
sparks
cnc
metalworking
cutter
spark
manufacturing
manufacture
closeup
industry
factory
production
plant
modern
industrial
work
machine
metalwork
precision
process
workshop
mechanical
machining
machinery
part
tool
heavy
engineering
cut
lathe
iron
instrument
turning
equipment
rough
automated
cutting
milling
working
operation
material
lathing
shaving