这个词是什么意思？
A very loosely defined group of drugs that tend to reduce the activity of the central nervous system. The major groups included here are ethyl alcohol, anesthetics, hypnotics and sedatives, narcotics, and tranquilizing agents (antipsychotics and antianxiety agents).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002492 · MeSH 2026。
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