Some people think bicycles have changed people¡¯s lives; some people think automobiles have changed people¡¯s lives. Personally, I think that airplanes have changed people¡¯s lives. There are many reasons why I hold this opinion, and I will explain two important ones due to this limited time. First, airplanes realized human biggest dream, which is flying in the sky. Second, all people of the world can largely reduce the time of travel