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

• 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。
• 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。
• Is the precursor of DHA to promote brain development and enhance memory.
  的前体，促进脑力发育和增强记忆力。
• 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。
• 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。
• But whether scientific cooperation can become a precursor for political collaboration is less evident.
  但是科学合作是否能成为政治合作的一个先兆，这并不明显。
• 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吗啡等生物碱的前体。
• 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。
• This was a necessary precursor to the development of calculus and a precise quantitative science of physics.
  这是一个必要的前体的发展，微积分和精确的定量科学的物理学。
• The effects of orthophosphoric acid concentration in precursor preparation on the catalyst behavior have been studied.
  考察了前驱体制备过程中磷酸含量对催化剂性能的影响。