1997年2月对日下午，一辆救护车和一辆警车一无一后，呼啸着驶入山东省临沐县周庄中心中学校园。几分钟后，两车又在一阵急促的警笛声中呼啸而去，随后，从该校传出了一个惊人心魄的消息：初三（一）班学生贾彦伟，持刀对准班主任老师头颅连砍两刀，酿成大祸。是什么原因使一双 In February 1997, on the afternoon of the same day, after an ambulance and a police car disappeared, they roared into the middle school campus of Zhouzhuang Center in Linmu County, Shandong Province. A few minutes later, the two cars whistled in a burst of whistling sound of whistling away. Then came an alarming message from the school: the third grade (one) class student Jia Yanwei, aiming at the head teacher’s head with a cut Two knives, causing disaster. What makes a pair of reasons