这个词是什么意思？
Naturally occurring family of beta-lactam cephalosporin-type antibiotics having a 7-methoxy group and possessing marked resistance to the action of beta-lactamases from gram-positive and gram-negative organisms.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002513 · MeSH 2026。
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