Now it is all globalization, and the commodity prices of each country can't operate independently, and they are all influenced by other countries, especially countries with high degree of internationalization or countries whose trade volume accounts for a large proportion of the global trade volume. For commodities with a high degree of internationalization, such as gold and silver, the peak of gold and silver trading was in the European period, which fluctuated greatly. Our country deals in Europe at night. Therefore, in order to avoid large fluctuations in the European period, the domestic market suddenly jumped sharply the next day, causing greater risks, so the domestic market also began to trade at night. Affected by commodities whose trade volume accounts for a large proportion of global trade volume, such as the soybean market in our country, more than 85% of soybeans in our country are imported from South America, and it is also night in our country when South America trades. It is also to avoid the big fluctuation caused by the trading of South American soybeans on the first day of opening in China, so the night market was launched! Because of time, the explanation is not detailed enough, but I hope it is useful to you.