请看母语定义，你最小的时候带你的人说的语言，就是母语

Why is it called mother tongue?

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It is indeed. In this metaphor, language is seen as coming from your primary caregiver, the person who looked after you most when you were young, and traditionally this was mothers. So, this is perhaps the point of origin, the starting place,of the metaphorical phrase, mother tongue.Oct 31, 2019