During the OS wars of a generation ago, it was hard to write software for one platform, let alone two, and developers were pressured to pick either Mac or PC, and quickly.

上一代操作系统之争时，就算为一个平台写软件也不容易，更别提两个了，开发人员被逼在Mac和PC上挑一个，还得要快。

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Mother pandas often let baby pandas stay alone for two days.

熊猫妈妈经常让小熊猫单独待两天。

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How many of our models will last nearly 1500 years, let alone one or two versions of an application?

有多少模型能够使用近1500年，更不用说应用程序的一个或两个版本了？

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Given their school's short history, nobody expected them to win a game at the NCAA tournament, let alone two.

NPR: No. 15 Seed Florida Gulf Coast Beats SDSU 81-71

One of the biggest concerns facing Chinese families today is how to afford raising one child, let alone two.

FORBES: China's Growing Problem Of Too Many Single Men

Nothing eats up a federal budget like a war, let alone two wars.

FORBES: Does Anyone Still Remember Why We Have The Bush Tax Cuts?