Adequate foreign exchange reserves are just like a country's strategic oil reserves. A big example is that one day China's oil resources are gone and foreign imports are gone, so the country's strategic oil reserves will be used. This is the same as foreign exchange. Unexpected events like the financial crisis two years ago test a country's foreign exchange reserves and its ability to deal with emergencies. Just as China was not affected by the financial crisis.

Financial emergencies refer to a series of economic and financial problems caused by a country's massive loss of foreign capital and the devaluation of its own currency in a short period of time.