It should be that the currency exchange rate of surplus countries has risen. A country's balance of payments surplus means that its exports are greater than its imports. Theoretically, the demand for its currency is greater than the supply, and its currency appreciates.

About exchange rate: There are two main expressions of exchange rate: one is expressed by how much local currency the unit foreign currency is converted into, that is, direct quotation, for example, China's 100 USD =637.35 RMB. In this way, the rise of exchange rate means that the unit foreign currency is converted into cost currency, that is, the local currency depreciates; The other is how much foreign currency the local currency is converted into, which is called indirect pricing method. Under this representation, the rise of foreign exchange rate means the appreciation of local currency.

Most countries in the world quote directly, so there is no special explanation. The direct purchase price is the default purchase price, and the exchange rate rises to the depreciation of the local currency. Generally speaking, the exchange rate refers to the conversion of foreign currency into RMB.