The country's official language is Spanish.

这个国家的官方语言为西班牙语。

Is English an official language in your country?

英语在你们国家是官方语言吗？

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。

The official language is Arabic.

阿曼的官方语言是阿拉伯语。

The official language is Albanian.

官方语言是阿而巴尼亚语。