英文關鍵字
accuracy
activity
blank
business
center
circle
cogwheel
control
cutter
cutting
drill
engine
engineering
equipment
face
factory
gear
grip
head
heavy
hole
image
industry
iron
lathe
line
machine
machining
manufacturing
material
metal
metallic
mill
milling
motor
occupation
power
production
safety
service
shavings
skill
stainless
steel
technology
tool
turning
work
workshop