It can be understood as a courtesy unique to Huaxia.
After all, many foreign scholars attended today's defense, especially those who are in theoretical physics and might have a relatively shallow understanding of number theory. Having Qiao Ze explain more thoroughly was helpful for the scholars in attendance to more clearly follow Qiao Ze's thought process.
Qiao Ze took about half an hour to address the questions proposed by the defense committee.
Afterward, the moderator followed the previously set procedure to invite the committee experts and mentor Li Jiangao to leave for an adjacent room to discuss whether to approve the paper, marking the moment many had eagerly awaited—the question and answer session.
...
Robert Stephen was the first to raise his hand.
It must be said that while Qiao Ze presented on stage, he listened extremely attentively.
