How did they become acquainted?是什么意思？

How did they become acquainted?

他们是怎样相识的?

how

adv. 怎样，健康状况如何，到何种地步，以任何方式；n. 方法，方式；

例句
He showed how the rich and powerful can abuse their position.
他让我们看到有钱有势的人是如何滥用其地位的。

did

v. 做( do的过去式)，干，学习，研究；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

become

vi. 变为，成为，变得，变成；vt. 适合，适宜，相称，相当，变成，发生；

例句
...abandoned buildings that become a breeding ground for crime.
沦为了犯罪温床的弃置楼群

acquainted

adj. 了解，知晓（某事），熟悉，交游甚广的；v. 使熟悉( acquaint的过去式和过去分词 )，使了解，通知，告知；

例句
He was well acquainted with the literature of France, Germany and Holland...
他对于法国、德国和荷兰的文学了如指掌。