first language
US /ˈfɜrst ˈlæŋɡwɪdʒ/
UK /ˈfɜːst ˈlæŋɡwɪdʒ/
名词
第一语言, 母语
the language a person has learned from birth or the language a person identifies with as their primary language
示例:
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English is her first language, but she also speaks French fluently.
英语是她的第一语言，但她也能流利地说法语。
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Learning a second language is easier if you have a strong foundation in your first language.
如果你的第一语言基础扎实，学习第二语言会更容易。