The foreign exchange reserves come from the difference between export and import. The large increase of China's foreign exchange reserves shows that China's export capacity is enhanced and there is a large trade surplus, while the increase of trade surplus shows the increase of China's real purchasing power.

But I think there is something wrong with this problem itself. In fact, the substantial increase in foreign exchange reserves does not mean the improvement of comprehensive national strength. For example, some oil-producing countries in the Middle East may have high oil prices, more oil exports and large foreign exchange reserves, but their comprehensive national strength is not strong, because it includes many aspects: political strength, economic strength, military strength, economic strength, cultural strength, diplomatic strength and so on.