英文關鍵字
angle
blank
closeup
detail
disc
disk
electric
engineering
equipment
factory
flame
grind
grinder
grinding
industrial
industry
instrument
man
manual
manufacture
metal
metallic
metalworking
pipe
place
plant
polishing
processing
rough
seam
sparks
speed
square
steel
surface
technical
technology
tool
unit
using
welding
wheel
work
worker
working
workman
workshop