Right now, we have this opportunity to prevent the extinction of countless species and ecosystems that are only just being discovered, let alone understood.

现在，我们有这个机会防止刚被发现，更不用说了解的无数物种和生态系统。

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Just how people think is still far too complex to be understood, let alone reproduced, says David Eagleman, a Stanford University neuroscientist.

斯坦福大学神经学家大卫·伊格曼说，人们的思维方式仍然太过复杂，难以理解，更不用说复制了。

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I barely understood the French, let alone how he knew they were ready.

我连法语都没大明白，更甭提他怎么知道火候到了。

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Before April 4, only a small percentage of consumers knew Epsilon by name, let alone understood what services they provide.

FORBES: Written By Ryan Deutsch

Though Chesley argued otherwise, the commissioner found he represented all the plaintiffs (as any law school grad should have understood, let alone the husband of a federal judge, counsel of record means, well, counsel of record).

FORBES: Superlawyer Stanley Chesley Faces Disbarment Over Fen-Phen Case

Since then we have not had a president who understood the monetary system the way he did, let alone appreciated the workings of the gold standard.

FORBES: Reagan's Monetary History