Buying a bill against selling is called active buying, and its quantity is included in "active buying (quantity)";

The selling order closed with the buying order is called active selling, and its quantity is included in "active selling (quantity)".

For example, if the current pending order on the disk is:

The (lowest) selling price is 35 10, and the selling volume is 120 lots.

The (highest) purchase price is 3509, and the purchase quantity is 100 lot.

If 10 lot is sold at the price of 35 10, then the volume of this 10 lot is counted as "active buying";

If the transaction price is 3509 and 20 lots are sold, then these 20 lots are considered as "active selling"