How to change money for a trip to Dubai?

It is suggested that the landlord exchange some US dollars in China. Dubai is the world's shopping center, and you can spend it directly in dollars. In addition, you don't need to carry a lot of cash with you. UnionPay cards can be used in most local shops, and it is also convenient to withdraw cash. You can use the UnionPay card of Huaxia Bank, and the first overseas withdrawal every day is free.