更不用说了

still less
adv. 更少
It's quite something to be made a government minister while still less than30.
不到三十岁就被任命为国务大臣，真是不简单。
If you don't know, still less do I.
如果你不知道，我更不知道了。
I did not even see him, still less talk with him.
我看也没看见他，更不用说跟他谈过话了。
我喜欢唱歌，更不用说听音乐了。
I enjoy singing, much more listening to music.
我很喜欢那顿饭，更不用说席间的谈话了。
I enjoyed the meal, not to mention(without mentioning) the conversation.
他连英语都不懂，更不用说法语和德语了。
He knows no English, to say nothing of French or German.
院子里已经是一团糟，更不用说房子了
The yard is a mess, to say nothing of the house.
这婴儿还不会走，更不用说跑了。
The baby can't even walk,let alone run.
e2.nuaa.edu.cn
如果连小事也做不好，更不用说大事？
If one can not do the small things well,let alone great things?

let alone

less than