If you want to speculate in foreign exchange, you need to exchange RMB for foreign exchange before you can speculate.

Since RMB is not a freely convertible currency, foreign exchange speculation does not include the buying and selling of RMB and USD.

I would like to suggest that the RMB is in the channel of appreciation. If you don't have foreign exchange on hand, don't speculate in foreign exchange, otherwise the profit from your speculation in foreign exchange can't make up for the exchange loss caused by RMB appreciation.