英文關鍵字
accuracy
activity
aluminum
business
center
circle
clamp
control
cuttings
drill
engine
engineering
equipment
factory
gear
grip
heavy
hole
industry
iron
lathe
line
machine
machining
manufacturing
material
metal
metallic
mill
motor
occupation
parts
power
production
safety
sawdust
shavings
skill
stainless
steel
technology
tool
tooling
turning
worker
works