This is the 263rd most frequent Chinese word.
案件
"案件" means "case" or "legal case."
In this sentence, "案件" means a legal or criminal case or a matter being investigated.
这是一个有趣的案件。
This is an interesting case.
Here, "案件" refers to a specific case being dealt with by the police.
警方正在处理此案件。
The police are handling this case.
In this context, "案件" denotes the subject of legal or investigative inquiry being examined by a lawyer.