Food engineering, food biotechnology, nutrition and food safety. Graduation thesis is a summative independent assignment. The majors of graduation thesis writing life are food engineering, food biotechnology, nutrition and food safety. Taking nutrition and food safety as an example, it is necessary to tell the contact and food eaten in life, which is closely related to life. Graduation thesis, also known as degree thesis, refers to the research report or scientific paper written by the author to obtain a certain degree.