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' 。
It's very difficult to see where we're going and the shower may pass in an hour or two. Let's rest and have some food.
“现在很难看到我们要去的地方。阵雨可能一两个小时就会过去,我们休息一下吃点东西。”