Having a doctorate or equivalent academic ability means that a person has the ability to enter the academic stage from the learning stage. The ability to produce original theoretical results or academic ability is the core connotation of doctoral degree, and it is also the most essential feature of people with doctoral degree.
Doctor is a title for graduate students studying for a doctorate, and it can also be used to address people who have obtained a doctorate. Enrollment is mainly conducted through the "doctoral entrance examination" held by ordinary colleges and universities with doctoral programs and relevant scientific research institutions with doctoral training qualifications.