In the morning of April 5, 2023, Ms. Xuelin Tian successfully passed her PhD oral comprehensive exam. The title of her exam report is “Factors affecting the greenhouse gas reduction benefits of road electrification in North America”. Her profound knowledge and excellent presentation helped her win a good evaluation from the external examiner, Dr. Zachary Patterson, and other examining committee members (Drs. Fuzhan Nasiri, Ahmed Soliman, and Chunjiang An).