機器
abrasive
accuracy
automotive
blur
buff
building
circle
circular
construction
corundum
cutting
detail
diamond
disc
disk
engineering
equipment
fabric
foundry
grinder
grinding
grindstone
industry
iron
machinery
machining
manual
manufacturing
metal
metalwork
metalworking
operation
people
plant
power
process
production
rotation
saw
sharpening
sparkles
sparks
steel
stick
tool
welding
wheel
worker
workshop