Yi Gang, deputy governor of the People's Bank of China (PBOC), speaks at a forum during the International Monetary Fund (IMF) and World Bank Spring Meetings in Washington D.C., capital of the United States, April 21, 2017. The PBOC, China's central bank, could play a role in promoting the wider use of Special Drawing Rights (SDR), said Yi Gang on Friday. (Xinhua/Bao Dandan)