How on earth did this happen?

这究竟是怎么发生的？

But how on earth is it eaten?

但究竟是如何吃法呢？

How on earth did you find out?

你怎么会知道的？

How on earth can you miss several buses?

你怎么会错过几趟公车的？

He did not know how on earth to answer.

他不知道究竟如何回答。

How on earth can one accomplish such a feat?

一个人怎么能够完成如此伟大的工作呢？

How on earth did you fall out of the window.

你究竟是如何从窗户掉出去的.

And how on earth will our conversation recover?

到底怎么样才能恢复我们的对话啊？

The gatekeeper asks, How on earth did you get Howard?

看门人问： “如何在地球上没有你霍华德？

But Herman, how on earth could you possibly know that？

但是赫尔曼, 你怎么会知道这事的？