Bank of China had better buy foreign currency. Because banks in China can exchange the most foreign currencies. For example: British pound, Hong Kong dollar, US dollar, Swiss franc, Singapore dollar, Swedish krona, Danish krona, Norwegian krona, Japanese yen, Canadian dollar, Australian dollar, Euro, Macau dollar, Philippine peso, Thai baht, New Zealand dollar, Korean won, etc. A large number of exchanges need to be made in advance. Because foreign currency exchange requires an ID card, each ID card can handle up to 50,000 US dollars, or other foreign currencies equivalent to 50,000 US dollars.

Dollar equals dollar, and dollar is dollar. At the end of World War II, 44 countries in the world held a meeting of 1944 in the United States. Print gold coupons according to the amount of gold. Such as an ounce of gold and a coupon.