이것이 가능할 수 있었던 것은 북일관계와 관련된 선행 연구에 이어, 뒤처져 있던 실증 연구의 성과가 본격적으로 제출되고 있기 때문이다.
This was achievable because, following prior research on North Korea-Japan ties, the results of empirical investigations that had been trailing were being submitted in earnest.