Some varieties are closely related to the external market, such as copper and soybeans. China is an importer of copper and soybeans. Due to the huge transaction volume in the external market, the world's largest copper pricing center is London LME, soybean pricing center is Chicago Board of Trade, and gold pricing center is new york Metal Exchange. Because of the time difference, their trading time is our evening, which is our closing time. Last night, the copper price of LME rose. Domestic speculators can see the skyrocketing abroad when they open the market software in the morning. When they were in call auction, they wouldn't buy or sell at yesterday's closing price, so they went high and low.