One is always on a strange road, watching strange scenery and listening to strange songs. Then one day, you will find that the things you have tried so hard to forget are really gone. The environment has a great influence on people. Learning from your teacher is the best way to create an environment to improve yourself. You should pay more attention to this point besides concentrating on your own research. Don't just close the door and read dead books. -Xiang Jingyu