英文關鍵字
aluminum
automated
chip
circle
closeup
countersink
cutter
cuttings
detail
disk
drill
drilling
electricity
engine
engineering
equipment
fabrication
gear
heavy
hole
industrial
industry
iron
machine
machinery
manual
manufacturing
metal
metallic
metalwork
parts
power
precision
process
profession
rotation
sharp
shavings
shiny
ships
steel
technology
tool
turning
work