(TTS發音) 1. in the world在世界上
Honolulu boasts that it has the best weather on earth. 檀香山以氣候最佳誇稱于世。
They consider themselves the wisest men on earth. 他們自認為是世上最聰明的人。
2. ever究竟
Where on earth did you find that cap？你究竟在哪兒找到那頂帽子的？
How on earth did you manage to do that？你究竟是怎樣設法做那件事的？
