answer: #Person1#'s sister is reminding #Person1# some precautions about riding a bike on the road in Beijing.
documents: #Person1#: I have learnt how to ride a bicycle. I plan to go to the Water Park by bike this weekend.
  #Person2#: Well, you know, the traffic in Beijing is sometimes dangerous. Therefore, I have to remind you of something. First, you should obey the traffic rules, don't break in the red light. Second, don't play a joke with your friends when riding on the bike. Third, do not hurry up when riding, or would make an accident. Finally, remember come on the left and go on the right!
  #Person1#: Oh, my dear sister, I am no longer a baby!