Because the currency issue in the article seems to be a bit confusing, it is specially explained separately. During the Republican period, the banknotes issued by the government became higher and higher with the expansion of the war, resulting in the continuous depreciation of banknotes. In the early days, it was relatively stable, that is, in the period before 1937, about one ocean (silver dollar) was equal to about 1,000 pieces of banknotes. In this book, it is agreed that before 1937, one gold bar was equal to five hundred oceans, and one ocean was equal to one thousand banknotes. After 1937, there was no paper money as a unit of currency, and there would be more stable currencies such as oceans, gold bars, and the US dollar.