a delivery boy的用法和样例：
- I used to work as a delivery boy.
- He was employed at the local grocery store as a delivery boy.
- Shrek： I'm no one's messenger boy. All right, I'm a delivery boy.
- He was seeing at the local newsagent's,where he worked as a delivery boy.
- It抯 a story about the fastest street racer of Mt Akina.Takumi, a delivery boy;Ryousuke, an engineer of speed;and Kyouichi, a professional racer: the three of them become duelists of drifts.
- A delivery van has brought the grocery order.