清华大学教授的女儿命丧北京公交车的事件震惊全国。一方是身处弱势地位的“乘客”,一方是并非强者的“售票员”,两个弱势群体之间为何会惊爆如此惨剧? The daughter of a professor at Tsinghua University who killed Beijing bus shocked the country. One is the “passenger” in a disadvantaged position, and the other is the “ticket conductor” who is not a strong person. Why is there such a terrible tragedy between the two disadvantaged groups?