英文關鍵字
angle
application
blank
circular
closeup
cut
detail
electric
engineering
equipment
factory
flame
grind
grinder
grinding
hand
holding
industrial
industry
instrument
iron
machine
man
manual
manufacture
manufacturing
metal
metallic
polishing
power
production
seam
shop
spark
sparks
speed
steel
technology
tool
use
welding
wheel
work
worker
workman
workshop