请问native language,official language,second language,foreign

native language
本机语言,机器各单元间编码语言 native language
【计】 本国语言
official language
官方语言
second language
n
a language other than the mother tongue that a person or community uses for public communication,esp in trade,higher education,and administration
a non-native language officially recognized and adopted in a multilingual country as a means of public communication
第二语言
foreign language
n.
外文,外语
好点的字典里应该都有涉及