on earth
US /ɑːn ɜːrθ/
UK /ɒn ɜːθ/
成语
到底, 究竟
used for emphasis after a question or to express surprise or shock
示例:
•
What on earth are you doing?
你到底在做什么？
•
How on earth did you manage to do that?
你究竟是怎么做到的？