这个词是什么意思？
A mass killing by firearm that consists of 3 or more killings in a single incident (H.R.2076 – 112th U.S. Congress (2011-2012): Investigative Assistance for Violent Crimes Act of 2012).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000097907 · MeSH 2026。
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