This is the 18012th most frequent Korean word.
수사했고
"수사했고" means "investigated" (past tense).
In this sentence, '수사했고' is used to indicate the act of conducting an investigation, typically by law enforcement authorities, followed by a connected action.
경찰이 범죄를 조사하기 위해 수사했고, 관련 증거를 찾았습니다.
The police investigated the crime and found relevant evidence.
Here, '수사했고' represents the act of investigating in a journalistic or inquiry context, leading to composing an article.
그 기자는 사건의 배경을 철저히 수사했고 신문 기사로 작성했습니다.
The reporter thoroughly investigated the background of the case and wrote a newspaper article.
In this context, '수사했고' means to explore or examine in a scientific or academic investigation, culminating in findings.