Meaning, it is what linguists concluded a parent language of Sanskrit, Latin and Greek would have to be like.

意思是，这就是语言学家得出的结论， 梵语、拉丁语和希腊语的母语应该是这样的。

Johnson said her school, for example, uses a phone app that permits teachers and administrators to send messages in English that will translate to the parent's language.

约翰逊说，例如，她的学校使用了一款手机应用程序。该应用程序会把教师和管理人员用英语发送的信息翻译成家长使用的语言。

Linguists study groups of related modern languages, then apply what they know about the rules that govern language change to deduce what the parent language must have been.

语言学家研究相关的现代语言群， 然后运用他们所知道的关于支配语言变化的规则来推断母语一定是什么。