The man's rude behavior dumbfounded me.

这个男人的粗鲁行为把我惊呆了。

The news on TV dumbfounded everyone.

电视上的新闻使所有人惊愕不已。

The congressman's remarks dumbfounded everyone present.

这个国会议员的言论惊呆了在场所有人。

You fail by leaving the reader dumbfound and clueless as to why you sent such a letter.

如果您的信函让读者一头雾水，让他们不知道您要说些什么的话，那这样的信函是不合格的。

I've seen more than a few hives throwing off a swarm, and never has one failed to transfix me utterly, or to dumbfound everyone else within sight of it.

我见过不少次蜜蜂分群，每一次都令我目瞪口呆，也令周围的其他所有人哑然失声。