In the morning of December 13, 2019, Ms. Mengfan Cai successfully passed her PhD oral comprehensive exam. The title of her exam report is “Emissions of Biogenic Volatile Organic Compounds from Terrestrial Ecosystem Influenced by Anthropogenic Activities”. Her profound knowledge and excellent presentation helped her win a good evaluation from the external examiner, Dr. Wenfang Xie, and other examining committee members (Drs. Fariborz Haghighat, Sang Hyeok Han, Christophe Guy, and Chunjiang An).