46 a.m., an NYU professor, her husband, and five-year-old son entered the PS 234 playground, a few short blocks from the World Trade Center.

上午 46 点，纽约大学的一位教授、她的丈夫和五岁的儿子走进了 PS 234 操场，距离世界贸易中心只有几个街区。