No. 15,000 in Korean
발견됐던
"Was discovered" or "had been discovered."
In a sentence
어제 공원에서 발견됐던 강아지가 주인과 다시 만났어요.
The dog that was found in the park yesterday reunited with its owner.
발견됐던 is used as an adjective describing the dog.
그 그림은 오래된 창고에서 발견됐던 예술 작품 중 하나예요.
That painting is one of the artworks that were discovered in an old warehouse.
발견됐던 functions as a descriptor for the artworks.
과학자들이 발견됐던 자료를 발표하면서 새로운 이론을 소개했어요.
Scientists introduced a new theory while presenting discovered data.
발견됐던 is employed to modify the noun data to indicate those that were found.
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