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1·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。

2·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。