대회에선

대회에선

"In a competition" or "at the tournament."

Here, '대회에선' specifies that the actions primarily occurred within the context of a particular competition. It's employed to mark the topic of the sentence, which is 'the competition.'

대회에선 많은 참가자가 상을 받았습니다.

In the competition, many participants received awards.

The use of '대회에선' highlights the competition as the setting where the described opportunity exists, serving as a backdrop for the actions.

대회에선 여러 가지 기술들을 보여줄 기회가 있습니다.

In the competition, there is an opportunity to showcase various skills.

In this sentence, '대회에선' identifies the competition as the scenario or environment where teamwork is critical.

대회에선 팀워크가 가장 중요한 요소입니다.

In the competition, teamwork is the most important factor.