Early in the fall semester of the 2025-26 academic year, Lisa Belkin, an adjunct professor at Columbia University’s journalism school, realized that one of her students, Jamie Beaton, had yet to show up for class. 2025-26学年秋季学期初，哥伦比亚大学新闻学院兼职教授丽莎·贝尔金发现，她的…