A doctor told his patient there was nothing really the matter with him. "All you requir is more outdoor life, walk two or three miles regularly everyday. By the way, what's your business?"

"I'm a letter-carrier." the patient answered.

医生告诉他的病人说他没有什么毛病。“你现在需要的就是更多的户外生活，天天坚持走二三里路。顺便问一下，你是干什么工作的？”

“我是邮递员。”病人回答。