1. Learners' self-driven and self-defined goals and outputs;
2. When returning to the group discussion, students should study independently;
3. Under the guidance of the teacher, complete the study through a group discussion of 4-6 people;
4. Key materials, such as data, photos, articles and videos.
5. The seven-step method is helpful to guide the whole process of project-based learning;
6. Conforming to the basis of adult learning theory;
7. Everyone in the group should play a role;
8. Allow cooperation to acquire knowledge;
9. Emphasize teamwork and communication, solve problems, and encourage individuals to take responsibility and share what they have learned.