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precursor

英 [priˈkɜːsə(r)]

美 [priˈkɜːrsər]

n.  先驱; 先锋; 前身

复数:precursors 

TOEFLGRE化学

Collins.1 / BNC.10361 / COCA.9664

牛津词典

    noun

    • 先驱;先锋;前身
      a person or thing that comes before sb/sth similar and that leads to or influences its development

      柯林斯词典

      • N-COUNT 先驱;先锋;前身
        Aprecursorof something is a similar thing that happened or existed before it, often something which led to the existence or development of that thing.
        1. Real tennis, an ancient precursor of the modern game, originated in the eleventh century...
          室内网球,现代网球运动的古老前身,起源于11世纪。
        2. He said that the deal should not be seen as a precursor to a merger.
          他说该笔交易不应该被看作是合并的前兆。

      英英释义

      noun

      • something that precedes and indicates the approach of something or someone
          Synonym:harbingerforerunnerpredecessorherald
        1. a person who goes before or announces the coming of another
            Synonym:forerunner
          1. a substance from which another substance is formed (especially by a metabolic reaction)

            双语例句

            • Comparing the ratio of testosterone to epitestosterone can then indicate whether testosterone or a precursor has been taken.
              因此测定睾酮与表睾酮的比例,能够反映出(运动员)是否服用了睾酮或者它的前体药物。
            • They then examined their arteries for arterial stiffness, often a precursor to high blood pressure and heart disease.
              然后研究者检查了被测试着的动脉硬化情况。动脉硬化是高血压和心脏疾病的前兆。
            • An amino acid that is essential for growth and normal metabolism; a precursor of niacin.
              生长和正常的新陈代谢所必需的氨基酸,烟酸的前体。
            • Hobbes is a precursor of modern positivism and analytical jurisprudence.
              霍布斯是现代实证主义法学和分析法学的先驱。
            • Exogenously supplied aspartate is not an active precursor of asparagine in plant tissues.
              外来供给的天门冬氨酸,在植物组织中并不是一个活跃的天门冬酰胺前体。
            • Cyanide can serve as precursor for the amide nitrogen of asparagine.
              氰化物可以作一个天门冬酰胺的酰胺氮前体。
            • Amphetamines is one kind of synthetic compounds whose precursor structure is amphetamine.
              苯丙胺类物质是一大类人工合成的以苯丙胺为母体的化合物。
            • This prediction was based on a number of geophysical observations of precursor events as well as abnormal animal behavior.
              除了对地震前兆的地球物理现象观察,这次地震的准确预测还要多亏对动物异常活动的观察。
            • The sol-gel coating was prepared with cellulosic fabrics and synthetic fabrics as carriers and TEOS as precursor.
              以纤维素织物和合成纤维织物为载体,以硅酸乙酯(TEOS)为水解前驱体,对织物载体进行溶胶凝胶涂层整理。
            • In plant cells the principal precursor of alanine, as well as leucine and valine, is pyruvate.
              植树细胞中丙氨酸和亮氨酸、缬氨酸的主要前体是丙酮酸。