300-272 is blank: 300 is the current turnover, that is, 300 lots are paired successfully; -272 indicates that the current order is successfully matched, and 272 lots are lightened; Empty, in which "empty" means the dominant selling direction, that is, the price of these 300 lots was sold at the buying price of the three prices at that time, that is, there were sellers outside the market who voluntarily traded at a price lower than that of the sellers who had placed orders in the three quotations, and the word "open" means that in these 300 hands, there were both opening positions and closing positions, according to ". Similarly, the buyer of passive trading also opens and closes positions, which is of course omitted. Others can be analogized, such as more opening, more leveling, more air exchange and air exchange.