According to the academic system of most majors, the undergraduate course is four years, the master's degree is three or two years, and the doctor's degree is two years, and most students go to college at the age of 19, so according to this calculation, students of Shandong University will get their doctor's degrees at about 28 years old, and some have joined the bachelor's and doctor's studies. Some of them are relatively cattle, and they may get their doctor's degrees at around 25 years old.