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

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。

《牛津词典》

It was difficult to understand the local dialect.

这种方言很难懂。

《牛津词典》

It is often appropriate to use the local dialect to communicate your message.

用方言来交流信息往往很合适。

《柯林斯英汉双解大词典》

Vatsaloo picked up Srithap's Thai-Laotian dialect, and accompanied him back to his village--in those days, a three-day trip.

FORBES: Heroes of Philanthropy

But the drinks are strong, and the locals - among them a few Long Island fishermen, known as Bonackers, or Bubbies (they once had their own dialect) - can't get enough of it.

BBC: Escape from New York

There even seems to be a European-English dialect evolving that is well accepted and understood.

ECONOMIST: Spreading democracy?