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

• An amino acid found in most proteins; a precursor of several hormones.
  多数蛋白质中的氨基酸，是许多激素的前体。
• They alter the way it cleaves amyloid precursor protein.
  它们改变了这个酶切割淀粉样蛋白前体的方式。
• It is a precursor of many aromatic compounds and of alkaloids such as curare and morphine.
  苯丙氨酸是苯化合物以及像箭毒和***等生物碱的前体。
• 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。
• Cyanide can serve as precursor for the amide nitrogen of asparagine.
  ***可以作一个天门冬酰胺的酰胺氮前体。
• 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。
• 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。
• 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。
• 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。
• This is because the active drug ingredient is not dopamine itself but various precursor molecules.
  这是因为活性治疗药物成分不是多巴胺本身，而是一些前体药物。