the world has changed for the better.为什么要加for和the

the world has changed for the better.为什么要加for和the the world has changed for the better为什么用for 还有better前为什么加the The world has changed for the better. the world has changed for the better . what has happened her The road has changed for the better是什么用法 make the world for the better the world has change for the 初三英语作文I have changed for the better word that has changed the world a word that has changed the world The day when my life changed for the better was the day when to our great ____(高兴）,the weather changed for better.