2. Doctoral students are graduate students studying for doctoral degrees, which is the highest level of postgraduate education. In people's daily life, they are admitted to doctors, read doctors and so on. Refers to a doctoral student. Strictly speaking, students who have not obtained a doctorate can only be called doctoral students; Only those who get a doctorate are real doctors. Therefore, according to international practice, in formal occasions, only those who have obtained a doctorate can be crowned with the title of "doctor"; This restriction can be waived in informal situations.