一天,警长无意间走到好友张教授家的门前。他按了半天门铃也没有人开门。于是,他看见窗户大开着,意识到很有可能发生了什么事情,便用身体撞开了大门。他进到客厅,发现卧室的门已经从里面锁死了。于是,他从窗户爬了进去,看见张教授已经死在了床上。房间内的一切景象似乎都表明他是自杀的。门上的锁孔里插着一把钥匙,经提取指纹,警长发现钥匙上留有 One day, the sheriff inadvertently came to friends in front of Professor Zhang’s home. He did not open the door bell for a long time. As a result, he saw the window wide open, aware of what might have happened, and used the body to open the door. He entered the living room and found that the bedroom door had been locked from the inside. So he climbed in from the window and saw Professor Zhang dead on the bed. Everything in the room seemed to indicate that he was suicide. A key was inserted into the keyhole on the door, and after the fingerprint was taken, the sheriff found the key left