He cannot speak French let alone write it.
他不会讲法语，更谈不上写作了。
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。
He cannot speak French, let alone write a letter in it.
他不会说法语，更谈不上用法语写信了。
He cannot speak French, let alone write a letter in it.
他不会说法语，更谈不上用法语写信了。
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