Expert lectures are works. According to the relevant information, the thesis is a stylistic type relative to short reports, summaries, summaries and lectures. The essay refers to "argumentative essay", which is a common form of expression in the genre of medical papers and has a specific concept. It is a written work formed by the author's own achievements, experiences and understandings in scientific research, clinic and teaching, and after strict logical argumentation and standardization. It is the most typical and representative style in medical papers.