这些看起来不错，但我敢肯定，它们吃起来是酸的。

The grapes look nice but I'm sure they are sour.

youdao

我还没有见到过劳伦斯，但我敢肯定他肯定是是最棒的，因为他是你选的。

I haven't met Lawrence yet. but I am sure he must be the best because he is your choice.

youdao

理论上听起来很好，但我敢肯定，肯这么做的管理者我用一个手就能数出来。

Sounds nice in theory, however I bet you could count on one hand how many times issues of this nature have been dealt with by management.

youdao