This is the 6498th most frequent Korean word.
연관
"Connection" or "relation."
In this sentence, '연관' is used to express a strong connection or association between the two subjects, the issue and the environment.
이 문제는 환경과 깊은 연관이 있습니다.
This issue is deeply related to the environment.
Here, '연관된' functions as an adjective, modifying 'documents' to indicate that they are associated or relevant.
그는 연관된 문서를 모두 검토했습니다.
He reviewed all the related documents.
In this case, '연관성' refers to the quality of being related, emphasizing the concept of correlation or relationship.