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。
• 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。
• 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。
• 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。
• 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 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。
• 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。
• 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。
• 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。
• 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。