This is the 12462nd most frequent Russian word.
китайцев
"Китайцев" means "Chinese people" (genitive plural form of "китаец").
The word 'китайцев' is the genitive plural form of 'китаец' (a Chinese person) and is used to indicate a group of people in the accusative case.
Вчера я встретил многих китайцев на улице.
Yesterday, I met many Chinese people on the street.
In this sentence, 'китайцев' appears in the genitive plural form, showing possession or association.
Мы обсуждали традиции китайцев в классе.
We discussed the traditions of Chinese people in class.
Here, 'китайцев' is used in the accusative plural form as the direct object of the verb.