you can understand the traded crude oil as an electronic contract. Then shorting can be understood as bearish on the future price of crude oil and buying a bearish crude oil contract at a certain price. This is a short-selling operation. If the price of the short-selling contract is 4,, wait until the price drops to 3,8 yuan. When the price of oil per ton drops by 2 yuan RMB, you sell this short contract. That is, liquidation. In this way, we can earn the difference of RMB 2 per t2. The platform I made is 15t, so this wave of decline can be transferred to 3 thousand yuan. This is the short selling mechanism.