Closing position is a term derived from commodity futures trading, which refers to the behavior of futures traders to close positions on futures contracts bought or sold before. Closing positions refers to selling long stocks that have been bought or buying back short stocks that have been sold in stock trading. Clearance has three meanings: first, the original meaning: clearing (inspecting) the warehouse; Second, the extended meaning: all sold. The word clearance is widely used, such as supermarket clearance and inventory clearance.