What if you're talking about a group of people that don't have any cows in their vicinity, let alone a sick cow?

万一你遇到一群人,他们附近连头奶牛都没有,更不用说受病毒感染的奶牛

耶鲁公开课 - 生物医学工程探索课程节选

To figure out even what this thing is, let alone how to use it properly. So, you know, I'm sympathetic.

就连认出这是什么东西（都很困难），更别说正确应用它了，所以我很同情这点。

经常犯的失误 - SpeakingMax英语口语达人

We don't do brain transfers,let alone have a half-a-brain transfers.

我们根本就不做大脑移植，更不用说半脑移植了。

耶鲁公开课 - 死亡课程节选

So you have to admit in fact it was surprising if only 1/4 teenager girls that everybody ask on the date by someone they don't like to go out with, let alone has been some sexual harassment, or sexual molestation, or sexual stocking, which was the lover of language that was used mostly in the media in reporting them.

因此你不得不承认，事实上这件事情令人惊讶,如果只有1/4的女孩子,被她们不想一起出去的人,邀请外出约会，那更不必说那些受到性骚扰，性侵犯和性跟踪的人，其实不过是过于咬文嚼字,正如媒体报道这些事情的时候所用的字眼一样。

麻省理工公开课 - 媒体、教育、市场课程节选

I barely know how to use a cell phone let alone a computer, you know,

我勉强会用手机，更不要说电脑了，你知道，

现在的孩子好可怕 - SpeakingMax英语口语达人