英文關鍵字
abrasive
blade
circle
cutter
disc
disk
electric
equipment
grindstone
hand
machine
machinery
making
man
metal
power
sharpen
sharpening
speed
steel
stone
technology
tool
wheel
work
worker
workshop
英文關鍵字
abrasive
blade
circle
cutter
disc
disk
electric
equipment
grindstone
hand
machine
machinery
making
man
metal
power
sharpen
sharpening
speed
steel
stone
technology
tool
wheel
work
worker
workshop