bloodletter

例句：

1. 1. The detective was called to investigate the mysterious murder.
   侦探被召去调查这起神秘的谋杀案。
2. 2.The police found a bloodstain on the floor near the crime scene.
   警方在犯罪现场附近的地板上发现了一个血迹斑斑的地方。
3. 3. The victim's bloodletter was found in his pocket, leading to the arrest of the killer.
   受害者的血迹被发现在他的口袋里，导致凶手被捕。