英文關鍵字
aluminum
angle
blade
board
circle
circular
closeup
construction
cut
diamond
disc
electric
engineering
equipment
factory
gray
grind
grinder
grooved
home
industrial
industry
iron
light
machine
machinery
manual
manufacture
manufacturing
metal
paper
part
production
protection
rotate
saw
sawing
sharp
spark
speed
steel
technology
tool
treatment
turning
wheel
work
worker
workshop
workshops