1.official language for USA.documents,signs,radio,TV programs,Newspapers,schools,work places...美国官方语言
2.foudation for any communication with other(s),与他人交流的基础.
3.most popular language in the world,(unofficial) official language for the world.最流行的世界语言.
4.tools to influence other countries 影响他国的工具
5.carrier and media of American customs and values 美国风俗和价值观的载体和传播媒介.