male teacher in a black professional suit walked (3) into the classroom and went straight to the podium. When Ye Fan saw the teacher, his face changed. Wasn't this the same teacher he had just bumped...y, what's going on" At this time, the security personnel from the school finally arrived.When Du Zilin saw the security director, he was overjoyed and shouted, "Director Su, please call 110!">Du Zilin...