1.to the contrary 意思是“相反的（地）” 他是对事物的评判.
词性：一般做后置定语
如：I shall continue to believe it until I get proof to the contrary.
在我未得到相反的证据之前,我会继续相信它.
If you don't hear something to the contrary I'll meet you at seven o'clock tonight.
如果你没有接到变更的通知,那么我们就定于今晚七时见面
2.on the contrary 意思是“而是恰恰相反” 指得是对上文关系的转折
词性:整个词组做状语
如：I thought the test must have been difficult. On the contrary it was easy.
我原以为那场考试一定很难,但恰恰相反,它很简单.
He is not poor, on the contrary, he is a millionaire.
他不穷, 相反, 他是个百万富翁.
希望能帮到楼主O(∩_∩)O