Afterwards, I visited the Department of Botany of Tokyo University in Japan three times from 1979 to 1989 and South China Institute of Botany in Kwangchow twice in 1989 and 1990.

• 继后赴日本东京大学植物系三次(1979至1987)，并赴广州华南植物研究所二次(1989，1990)；