Personally, I think it's dollars and RMB. One is that the US dollar, as a reserve currency, is widely used in countries outside the United States and eventually becomes an international currency. Second, China has a strong economy. When a country's economy is strong, it will be attractive to other countries. The basic principle of economics is that prices are determined by supply and demand. When people are optimistic about China's economy and increase their willingness to hold RMB assets, especially in Southeast Asia or Africa, doing RMB foreign exchange is also a good choice.