機器
abrasive
ancient
antique
art
background
blade
circle
circular
closeup
cut
device
electrical
engineering
equipment
fabrication
friction
grind
grinder
hand
heavy
hone
industrial
industry
iron
knife
machinery
manufacture
manufacturing
metal
people
power
process
production
shape
sharpen
sharpener
sharpening
spark
sparks
steel
stone
technology
tool
traditional
typical
wheel
work
worker
workshop