Li Ruiyu, Chinese embassador to Italy, speaks during the opening ceremony of the 15th World Congress of Chinese Medicine (WCCM) in Rome, Italy, Nov. 17, 2018. Traditional Chinese medicine helps promote sustainable agriculture, as it offers a holistic approach to disease prevention while using organic herbal products often grown by small-scale family farmers, the UN Food and Agriculture Organization (FAO) chief said here Saturday. (Xinhua/Cheng Tingting)