解释这一现象，需要使用母语认同（Linguistic Identity）这一概念。母语认同，即儿童的父母认为什么语言是儿童的母语，或儿童长到一定年龄之后自认为什么语言是他的母语。
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国际母语日是我们强调作为社会、经济与文化生活之基础的语言对于群体与个人的认同感所具有的重要意义的良好时机。
International Mother language Day is an ideal opportunity to highlight the importance of languages to group and individual identity, as the foundation for all social, economic and cultural life.
母语让我们在成为环球化城市和面向全球时，不至于失去自我认同之信念和尊严。
Our mother tongues will allow us to be a global city, reaching out to the world, without losing a sense of confidence and pride in our own identity.
第一语言与母语是交叉概念，决定母语的不是语言获得的顺序，而是民族或自己的语言认同。
First language and mother tongue are overlapping concepts. It is the language identity of a nation or an individual that determines the mother tongue, but not the sequence of acquisition.
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