The second major is usually referred to as "the second major" for short, which means that in some universities, students can choose a second major other than this major by applying. The difference between the second major and the minor major is that you can get the degree certificate of the second major (usually marked as the second major) after completing your studies, while the minor major only has the minor certificate. Accordingly, the second major should complete more courses than the minor, and at the same time write a graduation thesis (the minor is not required). Different schools and majors have different requirements for the second major. Some schools stipulate that students can only choose their second major, while others don't. Students can freely choose from the second major catalogue provided by each college. For majors with a large number of applicants, classes are generally held separately (courses are usually arranged in the evening or on Saturday and Sunday) and exams are held separately. For majors with a small number of applicants, classes are generally not held separately, which may conflict with the courses of this major and require students to coordinate themselves. The course of the second major generally starts from the next semester of sophomore or junior year. Because graduation design and graduation thesis are needed, they usually graduate together with this major, and some schools stipulate that the graduation of the second major will be postponed for one year.