Let Alone with “bié shuō... jiù shì...”

他这几天忙得连饭都顾不上吃，别说休息，就是睡觉的时间都不够。

Tā zhè jǐ tiān máng de lián fàn dōu gù bu shàng chī, bié shuō xiūxi, jiù shì shuìjiào de shíjiān dōu bù gòu.

He has been so busy these days that he does not even have time to eat; let alone rest, he does not even have enough time to sleep.

这种专业性这么强的文章，别说一般读者，就是很多专业人士也未必能一下子看懂。

Zhè zhǒng zhuānyèxìng zhème qiáng de wénzhāng, bié shuō yìbān dúzhě, jiù shì hěn duō zhuānyè rénshì yě wèibì néng yíxiàzi kàn dǒng.

For such a highly specialized article, let alone ordinary readers, even many professionals may not be able to understand it immediately.

他现在的状态，别说参加比赛，就是正常训练都很困难。

Tā xiànzài de zhuàngtài, bié shuō cānjiā bǐsài, jiù shì zhèngcháng xùnliàn dōu hěn kùnnan.

In his current condition, let alone participating in a competition, even normal training is very difficult.