为提高效率，这两家公司已合并。

The two companies consolidated for greater efficiency.

《牛津词典》

这两家公司的总部都位于肯特郡。

Both firms are based in Kent.

《柯林斯英汉双解大词典》

这两家公司合并成一家公司。

The two companies were amalgamated into one.

《牛津词典》

So that could be a firm, it could be a law firm, for example, and they're going to share equally in the profits .

比如说可能是个律师事务所,这两家公司平分利润

耶鲁公开课 - 博弈论课程节选

Fannie Mae and Freddie Mac what did they do and what role did they play?

房地美和房利美,这两家公司的职能是什么？

斯坦福公开课 - 经济学课程节选

So one example would be a firm that they both earn, sorry, they both own, and another example would be two of you working as a study group on my homework assignment.

也就是说这两家公司互相赚钱,我说错了,是交叉控股,另外一个例子是两名同学,为了做作业组成了一个学习小组

耶鲁公开课 - 博弈论课程节选