证人的证词与嫌疑人的不在场证明相矛盾。

The witness's testimony ___contradicts the suspect's alibi.

如果你说一套做一套，那就是自相矛盾。

If you say one thing and do another, you ___contradict yourself.

这两种科学理论似乎相互矛盾。

These two scientific theories seem to ___contradict each other.