First of all, undergraduates only have graduation defense, and junior college students don't write graduation thesis and graduation defense.

Secondly, the so-called public defense is an exemplary way of defense. Participated in the public debate in May. In our school, the teachers who take part in the defense are all university teachers above associate professor level. In the process of defense, it is more formal and standardized.

Finally, private defense is ordinary defense. This kind of defense may be relatively simple, not as strict as public defense, and not all the teachers in the defense group are professors.