This is the 2752nd most frequent Korean word.
예선
"예선" means "preliminary round."
In this sentence, '예선' refers to the preliminary round in a competition, used as the subject.
예선에 참가한 팀이 많이 있습니다.
There are many teams participating in the preliminaries.
Here, '예선' is used to indicate the stage in the event during which the athlete performed, serving as an object.
그 선수는 예선에서 최고 점수를 기록했습니다.
That athlete recorded the highest score in the preliminaries.
In this sentence, '예선' describes the hurdle that needs to be overcome, serving as a conditional situation.