This is the 480th most frequent Romanian word.
aceștia
"These" (masculine or mixed plural demonstrative pronoun).
In this sentence, 'aceștia' is used as a pronoun introduced here to specify a particular group of people (the students).
Aceștia sunt elevii care participă la concurs.
These are the students who are participating in the competition.
Here, 'aceștia' is a pronoun that acts as the subject of the sentence, referring to a previously introduced group (e.g., students).
Aceștia primesc mereu sprijin din partea profesorilor.
They always receive support from the teachers.
In this sentence, 'aceștia' refers back to a preceding subject ('câini') to provide additional information about them.