英文關鍵字
bearing
chisel
circular
clean
closeup
construction
cut
cutting
danger
disc
electric
equipment
fly
grind
grinder
grinding
hand
heat
heavy
industrial
industry
iron
light
machine
making
manual
manufacture
manufacturing
material
mechanic
metal
metallic
polish
process
processing
professional
profile
repairman
rolling
rotate
rotation
round
rusty
safety
sharp
spark
sparks
speed
steel
structure
technical
technology
tool
using
wheel
work
worker