1·His first language is Welsh.
他的母语是威尔士语。
—— 《牛津词典》
2·Italian is my first language.
意大利语是我的母语。
—— 《牛津词典》
3·Try not to think in your first language and translate your ideas into English.
试着不要用你的母语去思考，把你的想法翻译成英语。
4·The report also says that the New Orleans police routinely conduct illegal stops and searches, especially of blacks and those whose first language is not English.
该报告还指出，新奥尔良警察经常进行非法拦截和搜查，对黑人和那些母语不是英语的人更是如此。
5·Scores are recorded on the Test Report Form along with details of the candidate's nationality, first language, date of birth and id number.
成绩单上记录了考生各项的考试成绩，并写明了考生的国籍、母语，生日和身份证件号。