In fact, it is another way of saying: after seeing many people buy a lot of orders, they will sell them at a certain time. This is called "flat multi-warehouse". Bearers sell empty orders first (equivalent to borrowing other people's subject matter first), and then buy the same amount in the market (the original goods are returned) to close the position. This is called a short position. In short, these two behaviors are called "liquidation". Because of the short-selling mechanism in the futures market, there is more trading behavior of "closing positions and shorting" than in the spot market.