Because it shows the sum of opening and closing positions in a certain period of time, the stock software will have similar problems. If someone actively sells 1000 lots and buys 1 lot at the same time, the software may display as actively buying1001b. It doesn't make much sense to dwell on this.
Dazhi is not the grandson of Qian Xuesen. Qian Xuesen's grandson is Lei Qian. Qian Xuesen, Han nationality, Shanghainese, originally from Hangzhou, Zhejiang