头两个符号是未知的，但商博良知道，在最右边重复出现的象形文字代表“S”的声音。

The first two of these symbols were unknown, but Champollion knew that the repeated hieroglyphs to the far-right symbolized an "S" sound.

youdao

栗子中害虫的命运在到达目的地之前是未知的。

The destiny of the pest in the chestnut is not known before reaching the destination.

youdao

一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。

A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.

youdao

This made me think of Mississippi Gene too and as the river poured down from mid America by starlight I knew, I knew like mad, that everything I had ever known and would ever know was One.

这又使我想起密西西比的吉恩,以及河流从美国中部倾斜而下的景象，我知道是很疯狂地，很疯狂地同样也有，我发现所有我知道或未知的事都是一体。

耶鲁公开课 - 1945年后的美国小说课程节选

I want to show you how easy it is to change the code. But, notice, once I've added this I actually have a problem. This is now an under-constrained problem. I have more unknowns than I have equations.

我加上这个条件后,我马上面临一个问题了,这就是现在是一个非约束性问题了,我的未知数比方程数多,你从代数中可以知道。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I am not going to take the time to solve it because I think that is a waste of class time, but those are the three unknowns.

但我并不打算把解这几个方程,我觉得那会是浪费课堂时间，但那是三个未知式。

麻省理工公开课 - 固态化学导论课程节选