For example, philosophy, science and so on, including the "Challenge Cup", the National Electronic Design Competition for College Students, national english contest for college students, science and technology projects and so on. Science and technology projects include many projects, specifically, things that have not been studied by predecessors, or further study the things of predecessors, so as to draw a conclusion! For example, you can investigate left-behind children, left-behind elderly people and other issues and find your own materials!