how on earth

• adv. 究竟如何

how on earth的用法和样例：

例句

1. How on earth do they manage to rob the bank?
   他们到底怎么抢了银行的？
2. How on earth did you manage that?
   你到底是怎么做的？
3. How on earth did you know it?
   你到底是怎么知道的？
4. He represented the power of money as Jack did: he was another king. As I watched them all paying court to him, I wondered how on earth he came to marry Alice.
   他和杰克一样代表着金钱的力量：他是又一位国王。当我看到他们，都对他表示尊敬时，我不明白他究竟如何会跟爱丽丝结了婚。