Open position: new purchase or new purchase contract. Opening positions can be divided into buying positions and selling positions. Buying a position means being bullish at a certain point, and selling a position means being bearish at a certain point. \x0d\\x0d\ liquidation: buy or sell existing contracts. Closing a position is to level the bullish or bearish list, corresponding to the selling and buying positions respectively; \x0d\ Ping Jin flattened the list built on the same day, which means that buying on the same day and selling on the same day is Ping Jin; \x0d\ Short positions are short positions, that is, selling positions; Empty position is short position, that is, buy position, close position and empty position; \x0d\ Long opening means long opening, that is, buy and open; Duoping is a long position, that is, selling positions and closing long positions.