The republic is a melting pot of different nationalities.

该共和国是一个不同民族的大熔炉。

《柯林斯英汉双解大词典》

Representatives of different nationalities gather in the same hall to discuss affairs of state.

各族人民的代表聚集一堂， 共商国是。

《新英汉大辞典》

Different nationalities， with a motherland.

不同的民族，同一个祖国。

youdao

Barbies have represented fifty different nationalities and are sold in one hundred fifty countries.

VOA: special.2009.04.06

A polyglot army, too, because of all the different nationalities.

他们来自不同的民族,说不同的语言

耶鲁公开课 - 欧洲文明课程节选

and here, I've like, all my friends are different nationalities and studying different things and,

在这里，我所有的朋友，他们来自不同的国家，学习不同的东西，

来自爱荷华 - SpeakingMax英语口语达人

People from at least 23 different nationalities were on board, according to Kenya Airways.

BBC: NEWS | UK | Britons on crashed airliner named

Excellent interpersonal and communication skills, ability to maintain effective working relationship with people of different nationalities and cultural backgrounds.

UNESCO: Vacancy : Chief of Unit (28/2/2011) (ADM 552 - (P1P2))

Ability to maintain effective working relationship with people of different nationalities and cultural backgrounds.

UNESCO: Job title