There are many people that I don't know before . Some of them are very thougtful, for the same quentions , they can give more persuative aswers, and some of them are very good at english and writing, they have wonderful writing skills,and Some of them is very learned and well-informed. There are many people come from different places, working in different professions or learning in different schools , having different experiences. This website is really great in combining different kinds of people together. I am very lucky to have the chance to learn here.