但是也有未知的未知，那些事情我们不知道自己不知道。

That is to say we know there are some things we do not known.

youdao

在座的大都处在“不知道自己不知道”和“知道自己不知道”阶段，尤其是后者，往往是造成迷茫，困惑和郁闷的根源。

Most here in a "do not know do not know" and "know that they do not know" stage, especially the latter, often causing confusion, the source of confusion and depressed.

youdao

经济学家J·K·加尔布雷思（JK Galbraith）指出，预言家通常有两种类型：“不知道”和“不知道自己不知道”。

The economist JK Galbraith observed, forecasters typically come in two kinds: those who don't know and those who don't know they don't know.

youdao

Now,the problem with this is that Papias and these other people didn't really know what they were talking about.

问题是帕皮亚和其他人,根本不知道自己在说什么。

耶鲁公开课 - 新约课程节选

I chose English Literature because when I started off a university, I didn't know what it was I wanted to do.

我选英语文学是因为当我刚上大学的时候，我不知道自己到底想做什么。

为何选那门专业？ - SpeakingMax英语口语达人

I think that those with the idea of we all gonna to die but what of it?

我认为正是那些知道自己会死,却又不知道死亡意味什么的人？

麻省理工公开课 - 电影哲学课程节选