A Reply to Ren An的用法和样例：
- A reply to this letter is mandatory.
- It's time you gave a reply to us.
- He didn't give me a reply to my letter.
- Sima Qian, the famous Chinese historian of the2 nd century B. C., was the author of the Historial Records. The quotation comes from his“ Reply to Ren Shaoqing's Letter”.