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' 。
Though the crew were at first under the impression that the lost ship had been found, the contents of the chest proved them wrong.
当一只箱子从海底被打捞上来时,甲板上人们激动不已。船员们开始认为沉船找着了,但海底沉箱内的物品证明他们弄错了。