on earth

phr

• ① 在地球上

• ②[加强最高级]世界上;全世界
  • the greatest poet on earth世界上最伟大的诗人

• ③[加强疑问句]究竟;到底
  • What on earth do you mean?你到底什么意思?

• ④[加强否定]全然,一点儿也(=at all)
  • Where on earth have they gone?他们到底到哪儿去了?
  • There's no reason on earth why you should help him.你毫无道理要帮助他。