on earth可以表示在地球上吗

　　例句：

　　The island is truly a heaven on earth.

　　那个岛堪称人间天堂。

　　How on earth can she afford that?

　　她怎么可能负担得起呢？

　　Why on earth would he want to go to such a place?

　　他到底为什么想去那么个地方？

　　There is no feeling on earth like winning for the first time.

　　初尝胜利滋味的感觉真是无可比拟。