英文關鍵字
abrasive
construction
craft
cut
disc
disk
electric
electrical
equipment
grind
grinder
grinding
hand
handle
industrial
industry
instrument
iron
job
machine
man
manufacturing
mechanic
metal
object
person
polish
polishing
power
processing
production
professional
repair
safety
spark
speed
steel
technology
tool
work
worker
workman
workshop