🗣️ 情景例句
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' 。
Do you usually do arithmetic on Sunday?
你通常在星期日做算术吗？
They had got away with thousands of pounds worth of diamonds.
他们已带着价值数千镑的首饰逃之夭夭了。