Yes, as long as it is marked JCB, you can brush it. If you use JCB's credit card machine to convert the euro amount into US dollars according to the current exchange rate of JCB, the international settlement organization, you can return the US dollars when you come back. You can also return RMB after opening the automatic foreign exchange purchase repayment function, and China Merchants Bank will convert RMB into US dollars and add it to the amount owed by US dollars.

In addition, if the shops in Europe have the UnionPay logo, it is best to use the UnionPay channel (your JCB is a dual-currency card of UnionPay +JCB), because if you swipe the UnionPay card machine, UnionPay will convert euros into RMB for bookkeeping, and you only need to pay back RMB when you come back, which saves a lot of exchange rates.