Before we go to school, we get our parents to supervise us all the time, so we live in a very safe environment. While when we go to school, parents can’t keep their eyes on us all the time, they are so worried about us, so they begin to tell us how to keep ourselves safe. The most important thing is that don’t talk to strangers, as a teenager, we haven’t had the ability to judge who is the good guy and who is the bad guy, so it is better not to talk to the strangers. The bad guys will like to talk to the teenagers, they want to do something to pay the teenagers’ attention, thus they can induce the children to go with them and do the bad thing. In order to protect teenagers’ security, teenagers are taught to keep distant from the stranger.