a bantamweight champion的用法和样例：
- A professional boxer weighing more than118 and not more than126 pounds(approximately53.5-57 kilograms), heavier than a bantamweight and lighter than a lightweight.
- It's a civic pride to have a champion.
- Every absurdity have a champion to defend it.
- The dog was a champion through and through.
- He's shown enough class for a champion chess player.