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

• 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。
• 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。
• 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。
• 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。
• 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。
• IDOL can even mediate the degradation of the receptor precursor in the endoplasmic reticulum.
  甚至，IDOL能调解内质网中受体前体的降解。
• 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。
• 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。
• Amphetamines is one kind of synthetic compounds whose precursor structure is amphetamine.
  ***类物质是一大类人工合成的以***为母体的化合物。
• 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。