１９９９年４月４日，一辆面包车高速通过某铁路口时将一名骑车人撞倒，随后连车带人翻入路沟。骑车人被压在车下，司机也被挤在车里，油箱跌破不住地往外冒油，情况万分危急。正在附近打扫卫生的北京铁路公安处看守所服刑人员于勇见状，一边高呼“快救人”，一边冲上前去和闻? On April 4, 1999, a van knocked down a rider while passing a certain high speed railroad and then even led a car into the road. The cyclist was pressed under the car, the driver was also squeezed in the car, the tank failed to take out the oil, the situation is extremely critical. In the vicinity of the Beijing Railway Public Security Department detention center cleaning prisoners in the courageous state, while shouting “quick rescue people”, while rushed forward and smell?