In fact, with the rise of foreign exchange speculation in recent years, the state strictly controls foreign exchange in order to stabilize the domestic financial market. Any citizen of China can cash the equivalent of $50,000 in foreign currency every year, which means he can sell the $50,000 in foreign currency to the bank, but if someone calls you from his account, even it is $6,543,800. Of course, it can't exceed $6,543,800 each time, otherwise the bank will get stuck and monitor. However, if you sell this foreign exchange to the bank, the annual quota is only 50 thousand. If you run out of foreign exchange, you can only transfer the remaining foreign exchange to relatives and friends and let them cash it with their own special foreign exchange quota.