... the alchemists（炼金术士） the early chemists（最早的化学家） chemical evidence for atoms（原子的化学证据） ...
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Early antibiotics were natural microbial products, But chemists have modified the structures of many to produce semisynthetic and even wholly synthetic ones.
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。
It is an attractive research field for chemists that clusters of early transition elements are prepared by the method of solid state synthesis.
通过固相合成技术制备前过渡元素金属原子簇是一个富有吸引力的研究领域。
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