We have not seen the letter, so we can hardly comment on it.

我们没见过那封信，所以很难对其加以评论。

《柯林斯英汉双解大词典》

You have not seen much of the neighborhood yet.

你还没见过附近的很多地方。

youdao

Children have not seen apple trees.

孩子们没见过苹果树。

youdao

And tens of thousands of elderly Koreans have not seen family members they left behind since the North invaded the South in 1950.

VOA: standard.2009.10.13

It appears to be useful in that way but I imagine it does more compelling things these days but I have not seen it myself.

那样看起来仿佛比较有效果,但我想这些天它非常引人注目,只是我自己没看到而已。

哈佛公开课 - 计算机科学课程节选

Now, I've got to tell you, for those of you who have not seen this movie, I'm about to spoil it. All right?

我先申明,没有看过这部电影的同学们,我要剧透了,好吧

耶鲁公开课 - 死亡课程节选

Women have not seen a decrease in their numbers in the Senate in three decades.

CNN: Pressure's on for New York governor to pick female senator

That helps explain why we have not seen the grand overhaul some hoped for.

WSJ: Business Asia: The Quietly International Yuan

Armstrong says the companies that have stayed only in programmatic have not seen their valuations grow.

FORBES: CEO Tim Armstrong Makes Case (Again) That AOL Is Finally On The Mend