ph.

1. It's far too late for you to go out and play football, not to mention the fact that it's raining.
你现在出去踢足球太晚了，何况又正在下雨。

1. 更不必说：make mention of 提及 . | not to mention 更不必说 . | at the mercy of 在...支配下 .

2. 更不用说：not in the least一点也不 | not to mention更不用说 | once and for all彻底地

3. 更别提...,更不必说：narrow down缩小或限制范围(使更确切) | not to mention更别提...,更不必说... | pave the way for为铺平道路;使...更易

4. 更别提：nothing but只有 | not to mention更别提 | on account of由于

adv

1. much less

e.g. she can't boil potatoes, let alone cook a meal

Synonym: let alone