national common language

基本解释

Every nation has its common national language.
各自的民族共同语。
If we had Chinese as a common language, national language, we would have split this country wide apart, and we would be foolish to have Malay or Tamil.
假如我们当初把汉语当作通用语或国语，我们可能会面临四分五裂的局面，同样，我们选择马来语或泰米尔语也是不明智之举。
Since the national common language of communication has been extensively adopted in the minority regions, it is universally adapted in the practice of the alternation and use of language.
少数民族都广泛兼用国家交际共同语，在语言的选择和使用上表现出对共同语的广泛认同；

The regional variations may include other musical instruments, but all are united by a common national language and artistic history.
UNESCO: Culture
Despite their common language and culture, Arab countries enjoy cultural variations and different national and sub-regional priorities and concerns which UNESCO takes into account when fulfilling its mandate.
UNESCO: OFFICE IN BEIRUT