他的母语是什么
What is his native language
以上为机器翻译结果，长、整句建议使用 人工翻译 。
我不知道他的母语是什么。
I don't know what his native language is.
youdao
I don't know what is his native language.
他的母语是什么？汉语。
What's his native language ? Chinese.
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