早期的抗生素是由细菌自然生成的产物，化学家改变许多结构产生出半合成或完全合成的抗生素。

Early antibiotics were natural microbial products, But chemists have modified the structures of many to produce semisynthetic and even wholly synthetic ones.

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早期的抗生素是由细菌自然生成的产物，化学家改变许多结构产生出半合成或完全合成的抗生素。

Early antibiotics were natural microbial products, But chemists have modified the structures of many to produce semisynthetic and even wholly synthetic ones.

youdao