What on earth is that 与 What is that exactly （那到底是什么?） 两句一样吗?

What on earth is rap? what is happiness on earth? What is the biggest animal on earth? what on earth is it anyway what on earth? WHAT ON EARTH怎么样 what on the earth? 英语翻译What on earth. What is the weather like in different places on earth? what is the biggest animal on the earth What is my working time on earth 英文什么意思 what on earth are you? what are there on earth What is love?That binds beyond life on earth?A couple who is in love should What is the highest mountain on earth and how is it What the book is about is friendship on earth,这句话中用到那些语法? 求翻译：What on earth is that man trying to do? 回答这个句子:what is the biggest animal on the earth?