这个词是什么意思？
A highly toxic gas that has been used as a chemical warfare agent. It is an insidious poison as it is not irritating immediately, even when fatal concentrations are inhaled. (From The Merck Index, 11th ed, p7304)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D010705 · MeSH 2026。
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