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[历史上的今天] 历史上的今天(4月20日)
1999年，两名学生在科罗拉多州立托顿的科伦拜高中开枪扫射，随后自杀。2018-07-03 编辑：Ceciliya
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[PBS访谈社会系列] PBS高端访谈:科伦拜校园事件伤痛远未消除
I got into this cycle where it was like it was on repeat, and all I could think about was how bad it was for me, and how horrifying it was.2019-04-19 编辑：Wendy
