“更不要说”用英语怎么说？

中文“更不要说”用英语表达为”to say nothing of ”。
to say nothing of
英[tu: sei ˈnʌθiŋ ɔv] 美[tu se ˈnʌθɪŋ ʌv]
[词典] 更不必说;
原例句：He can't even feed himself，to say nothing of feeding his families .
词组
to say nothing of something 而且还
to say nothing of it 还用说
例句
1、The actual world, to say nothing of the infinite universe, demanded a sterner, a real masculine character .
但这个现实世界--且不说广袤无限的宇宙吧--需要的却是一个男人，一个真正的男子汉。
2、He had to go to prison for a month , to say nothing of the fine .
他得入狱一个月，更不用说罚款了。
3、"there were no longer any ground forces in existence, to say nothing of air forces," says speidel .
斯派达尔说：“地面部队已荡然无存，更不用说空军了。”
4、I can ' t speak english , to say nothing of chinese.
我不会说英语，更别提中文了。
5、He was quite tired out with pacing the streets, to say nothing of repeated disappointments .
单是在大街上走来走去已经使他十分疲乏，不用提那一次又一次的失望了。

let alone 才是最地道的说法
(Not to mention; much less:)
更不用提；更别说：
“Their ancestors had been dirt poor and never saw royalty, let alone hung around with them”(Garrison Keillor)
“他们的祖先穷得要命，从来没有见过王族成员，更不用说和他们在一起了”(加里森·谢勒)

“更不用说”的英语说法：

1. say nothing of

   例句：Even my mother is in the dark about it, to say nothing of me!

2. 2.quite apart from

   例句：This was a serious breach of trust quite apart from the gravity of any offence.

3. not to mention

   例句：Lots of periodicals in foreign languages have been subscribed

   to, not to mentionthose in Chinese.

4. without mention

   例句： I recall no mention of it in the article.

let alone是"更不用说"意思.此外与此相似的还有,what's more.等.

let alone
更不用说
He hasn't enough money for food, let alone amusements.
他连吃饭钱都不够，就更不用说玩儿的钱了。