In 1985 a French television company sent its reporters to the Paris Metro. They took cameras to see what passengers would do if they saw someone attached on the platform or in the trains. They acted out incidents. The incidents looked real but they were all done with the help of actors. However, very few people tried to help, and most passengers pretended not to notice. in one incident, a foreigner was attacked by three men. The attack was on a train which was quite full, and although one man tried to get the passengers to help, they all refused.  
It seemsthat suchbehaviour(行为) is not unusual, but the question is why? Is it a problem of big cities, or would the same thing happen anywhere? To discuss these questions, we have in the studio(演播室) Professor Wilson, who is an expert on the subject…