鏈輪

sprocket

chain / cable (unit of length: 100 fathoms, about 185 m) / chain (unit of length: 66 feet, about 20 m) / to chain / to enchain

wheel / disk / ring / steamship / to take turns / to rotate / by turn / classifier for big round objects: disk, or recurring events: round, turn

wheel; disk; ring / steamship / to take turns; to rotate / classifier for big round objects: disk, or recurring events: round, turn