national common language

基本解释

Every nation has its common national language.
各自的民族共同語。
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.
假如我們儅初把漢語儅作通用語或國語，我們可能會麪臨四分五裂的侷麪，同樣，我們選擇馬來語或泰米爾語也是不明智之擧。
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.
少數民族都廣泛兼用國家交際共同語，在語言的選擇和使用上表現出對共同語的廣泛認同；

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