(1)let alone，如：Fewer and fewer of today’s workers expect to spend their working lives in the same field, let alone the same company.（今天, 越来越少的人愿意在同一领域工作一辈子，更不用说在同一家公司了。） (2)not to speak of (后接名词)，如：His friends and colleagues will be very upset, not to speak of his parents. （他的朋友和同事都会为此事难过，更不用说他的父母了。） (3)not to mention或without mentioning (后接名词)，如：We were served French champagne, not to mention usual cocktail.（他们连法国香槟酒也端来给我们喝，更不用说平常的鸡尾酒了。） (4)to say nothing of (后接名词或动名词)，如：This sentence is very awkward, to say nothing of its being obscure.（这个句子别扭得很，更不用说它语义晦涩了。） (5)much/even less (后接代词﹑动词或句子)，如：I never think of it, much less say it.（我想都未想到它，更不用说讲到它了。）
