关于second作为第二种语言翻译为“as a second language”,其中的a可不可以改成the?还有什么时

作为第二门语音的英语为什么as a second language?应该是as the second language麽 learn English as ( a ) second language.这里为什么不填the啊`语言前面不是不加冠 English_____in China as a second language. learn English as ( a ) second language. I speak English as a second language 里面as是起什么作用的修饰什么的 the second 、a second 的区别 the second a second的区别 the second和a second的区别 a second day 怎么翻译.第二天?例句：The polls are open for a second day English _____(use)as a second language in some countries why english is very important as a second language? How mang people learn English as a second language