What is real is rational是什么句型?

What is real is rational是什么句型? what is real love? What Is Real,What Is Doubt 歌词 What is a real friend? 现实世界到底是什么?（What is the real world?） the classroom is a real mess.中为什么要用is a real mess?这是什么句型或语法? To learn that what is most valuable is ...是什么句型? What is the real meaning of life? What is the real meaning of "love"! What is a real man like is what people see the real artical Is a long-distance relationship rational?