used to show that you think or feel the opposite of what has just been stated

正相反，恰恰相反

A: I thought you said the film was exciting?

你不觉得这部电影很精彩吗?

B: On the contrary, I nearly fell asleep half way through it!

正相反，看到一半我差点睡着!

I was worried that it might be too hard for me but it turned out the contrary was true.

我原来担心那可能对我来说太难了，可是我发现恰恰相反。