In fact, linguists often argue about this subject, and it's a complicated one.

实际上，语言学家经常在这个问题上有争议，这是很复杂的一个东西。

耶鲁公开课 - 现代诗歌课程节选

We have also some severe problems in Belgium because it's a country where they speak different languages.

比利时有很严重的问题，因为人们说不同的语言。

比利时和美国的差异 - SpeakingMax英语口语达人