He cannot speak French let alone write it.

他不会讲法语，更谈不上写作了。

youdao

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。

youdao

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。

youdao

It clearly was not easy to live, let alone write.

WSJ: Wall Street Journal: Twelve Months of Reading

Without long-term, paid-up capital, it is hard to write multi-year policies, let alone to organise insurance-backed bond issues or derivatives.

ECONOMIST: Lloyd��s of London

When she began to write, shortly after the war had ended, it was hard to get hold of cream, let alone capers.

ECONOMIST: What cookbooks really teach us