英语选修八Unit1大课文THESPANISH这一段最后一句,Thatiswhytodayover40%ofCaliforniansspeakSpanishasafirstorsecondlanguage.“first”前面为什么要加“a”?请多多指教,感激不尽,

Question

英语选修八Unit1
大课文THE SPANISH 这一段最后一句,That is why today over 40% of Californians speak Spanish as a first or second language.“first”前面为什么要加“a”?请多多指教,感激不尽,

Answer 1

a 加序数词是又一 再一的意思
序数词前可加a.但需区别：
不定冠词（a/ an）+序数词 表示"又一/再一"的意思
定冠词（the）+序数词 表示"第几"的意思
This is the second time I have come here.第二次来
The man had two houses in the country,and he bought a third
one.又买了一所房子.