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.
In foreign countries, it refers to people who have obtained doctoral degrees, and doctoral students are also called so-and-so doctors Among the three levels of bachelor, master and doctor, doctor is the highest level.
As a few people on the ivory tower, doctoral students are deeply envied by everyone. They are a symbol of wisdom and ability, a dream that most people can only dream of, and a reserve army for the country's future scientific, technological and economic development.
References:
Baidu encyclopedia-doctor