No. 13,564 in Russian
национальностей
"Nationalities."
In a sentence
В нашей школе учатся дети разных национальностей.
In our school, children of different nationalities study.
Here, 'национальностей' is used to refer to the attribute of 'different nationalities.' It's plural genitive form indicates diversity.
Их клуб объединяет множество национальностей.
Their club unites many nationalities.
The word 'национальностей' is applied in the genitive plural to express the variety of nationalities involved in the club.
Мы должны уважать культуры и обычаи различных национальностей.
We must respect the cultures and customs of various nationalities.
In this context, 'национальностей' is used in the genitive plural to signify belonging to diverse cultural groups.
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