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' 。
She instructed in her will that if that were to happen, all the money should go to an organization for helping the blind called Helping Hand.
于是她在遗嘱中指示如果此事发生,这笔钱应该全部捐献给一个名叫'援助之手'的盲人救济组织。