劃紅精講：
1. what on earth...
on earth（用于以how， why， what 或 where 開始的問句，表示強調，通常表示問題沒有答案或很難回答）究竟，到底；
eg. How on earth did that happen?
那件事到底怎么發生的？
eg. What on earth had Luke done?
盧克究竟做了什么？
eg. Why on earth would he want to go to such a place?
他到底為什么想去那么個地方？
2. be unfamiliar with
不熟知的；不了解的；
eg. I am unfamiliar with the place and the people here.
我在這兒人地生疏。
eg. A foreigner is usually unfamiliar with many customs of a country.
一個外國人通常不熟悉別國的風俗習慣。
3. shut up
（使）住口；（使）閉嘴；
eg. Just shut up, will you?
閉嘴，好嗎？
eg. I don't feel like shutting up; I think statements about injustice should be made.
我不想住口，我認為應該發表關于不公正的聲明。
eg. A sharp put-down was the only way to shut her up.
對她冷嘲熱諷是讓她閉嘴的唯一方法。