機器
abrasive
ancient
blade
closeup
cut
cutter
danger
device
disk
electric
electrical
electricity
equipment
friction
grind
grinder
hand
handle
industrial
industry
iron
knife
machinery
man
manual
metal
metallic
motion
occupation
power
rotary
service
sharp
sharpen
sharpener
sharpening
skill
speed
spin
steel
tool
traditional
vintage
wheel
work
worker
workshop