The scientists know very little about them.科学家们对它们了解甚少

know about知道； 了解； 听说过有关 ... 的情况

I feel that I know about the value of my own work.

我觉得我知道自己工作的价值。

I'd love to know about the plan.

我想知道这个计划。

It is about getting the samples out,我们需要取出样品

get sth out把...取出

How am I going to get out of this jam?

我怎样才能摆脱困境呢？

He could not get it out of his head.

他无法忘掉这件事。

This is where their new drugs come from.这就是新药物的来源地

come from来自； 起源于

Correct ideas come from social practice.

正确的思想来自社会实践。

We heard clink come from that room.

我们听到那个屋子传来叮当声