mother tongue
US /ˈmʌð.ər ˌtʌŋ/
UK /ˈmʌð.ər ˌtʌŋ/
1.
母语
the language that a person has grown up speaking from childhood; the native language of a person or a group of people
:
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English is my mother tongue, but I also speak French fluently.
英语是我的母语，但我也会说流利的法语。
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Learning a new language is easier if you have a strong foundation in your mother tongue.
如果你的母语基础扎实，学习一门新语言会更容易。