A proof 证明

A man came to a village post office for a registered letter. The letter was there, but the clerk did not give it to the man. "How can I know that the letter is for you?" he asked.

The man took a photo of himself from his pocket, and said, "I think now you know who I am?"

The clerk looked long at the photo and then said, "Yes, that is you. Here is your letter."

一个人去乡村邮电所取挂号信。 信来了，可工作人员却不给他。“我怎么知道这信是你的？”工作人员说。

这人从口袋里拿出自己的一张照片，说，“我想你知道我是谁了吧？”

工作人员看了一会说：“这的确是你，信给你吧！”