If you don't know a person's last name, use 'ma'am' or 'sir'.
如果你不知道一人的姓, 你应称呼他为 'ma'am' 或 'sir' 。
No, Jeanne, I wasn't ill. I know I look older than my age now. That's because of hard work-ten years of hard work.
没病,让娜,我没生过病。我知道我看上去比我的年纪要大些,那是因为劳累的缘故--10年的劳累呀!