This is the 9063rd most frequent Korean word.
개회사에서
"During the opening speech."
Here, '개회사에서' is used to indicate that the action takes place during the opening speech, demonstrating its temporal locative function of the phrase.
개회사에서 그는 환영사를 발표했습니다.
In the opening speech, he delivered a welcome address.
'개회사에서' serves to specify the context of the speech in which the subject explained a vision, showing the contextual importance of the phrase.
그녀는 개회사에서 회사의 비전을 설명했습니다.
In the opening speech, she explained the company's vision.
The word '개회사에서' here acts to situate the expression of gratitude within the event of the opening speech, emphasizing its circumstantial relevance.