It was too expensive, to say nothing of the time it wasted.

这太贵了，更不用说它浪费的时间了。

《牛津词典》

Even grown-ups can't lift it, to say nothing of children.

连大人都举不起来，更不用说孩子了。

youdao

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

这事连我妈都不知道， 别说我了!

《新英汉大辞典》

So, find an important problem. Work on it, and to say nothing of the wireless device there.

所以，找到了关键问题，并努力去解决它，先说明，这并没有无线设备。

麻省理工公开课 - 固态化学导论课程节选

Now,it's very tempting at this point to say,look,of course Nothing could be easier ? Just imagine being in heaven forever,right?

现在我很想说，当然了,这没什么难的,只要想象永远在天堂就行了对不对？

耶鲁公开课 - 死亡课程节选

The United States can no longer indulge in such a dereliction of duty, or tolerate, to say nothing of encourage, it in others.

CENTERFORSECURITYPOLICY: From Londonistan to Palestan

It flatters a vacant-eyed kid with a joystick (to say nothing of the grownups who have bought it for him or sold it to him) to think of himself, spiritually, as an intrepid spelunker.

NEWYORKER: Master of Play

It is now apparent that Lockheed never properly integrated Martin Marietta after their merger in 1995, to say nothing of 39 smaller acquisitions it has made in the past seven years.

ECONOMIST: Wanted: miracle worker