She studied eight foreign languages but is fluent in only six of them.

她学了8种外语，但流利的只有其中的6种。

《柯林斯英汉双解大词典》

There were originally six of them.

最初它们有六个。

youdao

Six of them were killed.

他们中有6人被杀害。

youdao

They brought the German rockets to America and launched sixty-six of them.

VOA: special.2009.06.10

I say, well, let's grade about five or six of them, maybe ten of them, get a sense of it.

我说，我们给它们中的5或6道题打分了，也可能是10道，大概了解一下。

麻省理工公开课 - 固态化学导论课程节选

What I have here is there is the 3p, there are six of them, and now it is telling me I should be able to put in ten more.

我现在要讲的3p轨道，有6个电子，上面的计算却告诉我,我还得再放十个电子。

麻省理工公开课 - 固态化学导论课程节选

Massachusetts General Hospital said it was treating 22 injured people, six of them in critical condition.

CNN: SHARE THIS

Most of the 21 have become severely ill, and six of them have died.

NPR: WHO Talks With China On Sending Bird Flu Team

In fact, I'm sure of it because all six of them walked me to my car.

CNN: Text of Bush's Notre Dame speech