1.概述 ntroduction 抗生素 Antibiotics 是生物在其生产活动过 Any organic substances 程中所产生,并能 produced by various 在低微浓度下有选 organisms that have the 择性地抑制或杀灭 power of arresting the growth of other 其他微生物或肿瘤 microorganisms or of 细胞的有机物。 destroying them3 抗生素 是生物在其生产活动过 程中所产生，并能 在低微浓度下有选 择性地抑制或杀灭 其他微生物或肿瘤 细胞的有机物。 Antibiotics Any organic substances produced by various organisms that have the power of arresting the growth of other microorganisms or of destroying them. 1. 概 述 Introduction