Generally, the bookkeeping method in our country is RMB, and the settlement currency in the United States is US dollars, which actually belong to two different currencies. Single-currency settlement is generally simple, but dual-currency settlement requires certain conditions. For the dual currency that we often see in our daily life, it is RMB and USD. The simple difference is that we can see the logo of UnionPay and VISA on the card, and the other thing that can be distinguished is that the card number is 43.
When we swipe our cards, we can generally do it not only on the POS machine marked with UnionPay, but also on the POS machine marked with VISA. In the form of repayment, when we swipe our card on the POS machine marked with UnionPay logo, we repay it in RMB. However, when we swipe our card on the POS machine marked with VISA, we still need to pay back the US dollars to the bank. In the form of bookkeeping, it is also in the form of dollars, which is still more important. Attention should be paid to exchange losses caused by exchange between different currencies.