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
• a person who goes before or announces the coming of another
  Synonym:forerunner
• 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。
• This study provided a precursor of N-propionyl-D-mannosamine for the tumor-associated carbohydrate antigen.
  为肿瘤相关糖抗原提供了N-丙酰甘露糖胺前体。
• Calcium deposits in the coronary arteries are considered a precursor of future heart disease.
  冠状动脉中的钙沉积是导致人们将来患上心脏病的先兆症状。
• 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。
• Provisions on the type, scope, measures and methods for the administration of narcotic drugs, psychotropic drugs and precursor chemicals;
  三是规定了麻醉药品、精神药品和易制毒化学品管制的种类、范围、措施和办法。
• 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。
• In this way, it's sort of a precursor to Apple's new GarageBand application.
  这样，它成为苹果公司的新GarageBand应用程序的先驱。
• Small cell lung cancer is neuroendocrine neoplasm and origins from apud ( amine precursor uptake decarboxylation) cell.
  小细胞肺癌是神经内分泌肿瘤，起源于apud（胺前体摄取脱羧化）细胞。
• Objective To study the effect of gypenosides on proliferation of neural precursor cells in vitro.
  目的探讨不同浓度绞股蓝皂苷对体外培养的神经前体细胞增殖能力的影响。
• Papain-catalyzed synthesis of aspartame precursor z-apm in biphasic solvent system wasinvestigated.
  本文报道在两相溶剂体系中利用木瓜蛋白酶催化合成aspartame前体z－apm的研究。