A living language, like English, is a language that people still speak and use in their ordinary lives.

现用语言，如英语，是人们在日常生活中仍在说和使用的语言。

Changes like these happen because, unlike say, Latin, which no-one speaks day-to-day, English is a living language – a language people speak and use in their ordinary lives.

之所以会发生这样的变化是因为，不像没有人会日常使用的拉丁语，英语是一种现用语言——人们在日常生活中所说或所用的一种语言。