official document language公文语言
Official communication language官方语言
Joint official language并行的官方语言
central china official language中原官话
the official language官方语言
non-official language非官方语言
One official language一种官方语言
Either official language语言
Being an international language and acting as official language in many countries, English language itself has shown great significance in international trade and communication.
作为一种国际语言和许多国家的官方语言,英语在国际贸易和交往合作领域中扮演者极其重要的作用。
参考来源 - 英语商务合同的语言特征及翻译原则