One of the main varieties of the language is spoken in Beijing.

北京是主要汉语种类发源地。

This international dimension suggests that in the future, there are going to be many Englishes, not just two main varieties.

随着国际广泛度越来越高，未来将初选许多“Englishes，而不再限定在英美两国。

Second, when the campaign began in earnest there were three main varieties of polio, each of which required a specially tailored vaccine.

第二，当此项活动开始正儿八经的进展的时候已经存在三类主要的小儿麻痹症，每一类都需要一种特别定做的疫苗。