on the contrary
exactly the opposite相反地
He is not selfish；on the contrary，he is very noble and generous．他并不自私，恰恰相反，他是一个非常高尚而又慷慨的人。
The teacher thought that the children went to the zoo； on the contrary，they went to the bakery． 老师以为孩子们去了动物园，恰恰相反，他们却去了面包房。