機器
blade
business
circle
close up
closeup
craftsman
cut
equipment
friction
grind
grinder
grindstone
hand
human
industrial
industry
instrument
iron
jobs
knife
machinery
man
manufactory
manufacturing
mechanism
metal
object
people
person
power
process
professional
sharp
sharpen
sharpener
sharpening
steel
stone
tool
traditional
whetstone
work
worker
workshop