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' 。
To facilitate carrying, rope or metal handles are indispensable and should be fixed to the boxes.
为便于搬运,绳子或铁把手不可缺少,并将其固定在箱子上。
Both planes were going to take off on July 25th, but Latham failed to get up early enough,
两天飞机都打算在7月25日起飞,但莱瑟姆那天起床晚了。