要说出同一语言的方言差异到什么程度就成为一种别的语言是不可能的。

It is impossible to say at what point along the continuum a dialect becomes a separate language.

《牛津词典》

这些语言互不相通，同一语言的各种方言则能相通。

All these languages are mutually unintelligible, but dialects within the same language may be intelligible to a degree.

youdao

法令指出连队应当尽可能地由同一民族的人或操同一语言的人组成。

It laid down that as far as possible companies should be composed of men of the same nationality or who spoke a common language.

youdao

Remember, language exists synchronically: it only exists in a moment, in a moment of simultaneity.

注意，语言存在于同一时间中：,它只存在于一个个时间截面上。

耶鲁公开课 - 文学理论导论课程节选

People who speak the same language could understand the people of northern Afghnastan who don't require 200,000 dollars a year as the sallary.

说同一种语言的人们可以理解阿富汗北部人们,这些人也不会要求年薪200，000，美元。

普林斯顿公开课 - 国际座谈会课程节选

You really have, therefore, for in some way the first time in history, a dream of making all of his empire basically universal, a dream of a universal vision, for one world, under one kind of culture, one kind of language.

因此某种程度上说，这是历史上第一次出现，梦想建立统一的帝国，同一个世界的愿景，同一种文化，同一种语言。

耶鲁公开课 - 新约课程节选