The incident was one of the worst mass-shootings in U. S. history - one that reignited debate over security measures at American schools.
这起事件是美国历史上最严重的集体枪杀案之一，由此引发了在美国校园安全措施的争论。
The incident was one of the worst mass-shootings in U. S. history - one that reignited debate over security measures at American schools.
这起事件是美国历史上最严重的集体枪杀案之一，由此引发了在美国校园安全措施的争论。
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