英文關鍵字
aluminum
angle
auto
blade
board
circle
circular
construction
craft
cut
diamond
die
disc
drill
electric
equipment
factory
grinder
hand
industrial
industry
iron
light
machine
manual
manufacture
manufacturing
metal
part
piece
power
production
protection
rotate
round
saw
sawdust
sawing
sharp
spark
speed
spin
steel
technology
tool
treatment
wheel
work
worker
workshop