English became the official language for business in spite of the fact that the population was largely Chinese.

虽然当地居民主要是中国人，英语却成了商业上正式使用的语言。

《牛津词典》

When the French ruled England, French was the official language.

当法国人统治英国时，法语是英国的官方语言。

youdao

The East African language of Kiswahili was chosen as the official language of Kwanzaa because it is a non-tribal language, spoken by a large portion of the African population.

东非的斯瓦希里语被选为宽扎节的官方语言，因为这是一种非部落语言，大部分非洲人都说这种语言。

youdao

English became the official language of Hawaii.

VOA: special.2009.12.02

It's as if a gap has opened up, a gap between the official argument of and the rhetorical figures or the metaphors, Milton's elaborately construed language, which he uses to illustrate that argument.

这就像是一个鸿沟在专著中的正式论点,和运用修辞和比喻的部分之间打开了，弥尔顿精心地解释和分析他用来，阐述这个论点的语言。

耶鲁公开课 - 弥尔顿课程节选

This happens when an official language is used more often and children stop learning the local language of their parents.

VOA: special.2009.12.02

The official language is Portuguese, after settlers first arrived in Mozambique in the 15th century.

CNN: How Mozambique turned from war zone to tourist hotspot

While Catholic services today are celebrated in local languages, Latin remains the official language of the Roman Catholic church.

CNN: Reporter first on pope story, thanks to her Latin skills

These expressions may sound important--and like the official language of a club you'd like to join--but they make no sense.

FORBES: Magazine Article