以下为句子列表：
英文: A chemical constituent (element or compound) of an alloy, which may be used to specify its composition.
中文: 合金的任一组成（可以是元素或化合物），可以被用于区分其构成成分。
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英文: Methods This paper reviewed the chemical constituent and pharmacological activities of platycodon on the basis of related references since 1980.
中文: 方法基于1980年以来的研究文献，回顾了桔梗的化学成分和生物活性研究进展。
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英文: The development and chemical constituent of porphyrin reagents are reviewed. The synthesis of porphyrin reagents, chemical reaction mechanism and conditions are described, and its trends are expatiated also.
中文: 摘要论述了国内外关于卟啉的研究进展、化学组成；阐述了卟啉类化合物的合成方法、反应历程及影响因素，并对卟啉类化合物的研究方向作了概述。
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