precursor

noun

1. 先驱；先锋；前身
   a person or thing that comes before sb/sth similar and that leads to or influences its development

1. N-COUNT 先驱；先锋；前身
   A precursor of 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。

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。
3. Exogenously supplied aspartate is not an active precursor of asparagine in plant tissues.
   外来供给的天门冬氨酸，在植物组织中并不是一个活跃的天门冬酰胺前体。
4. 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。
5. 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。
6. 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。
7. Based on studies of precursor events and unusual animal behavior, a warning was issued by local authorities.
   当地政府根据震前先兆与动物的反常行为，发出了地震预警。
8. 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。
9. 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。
10. 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。
11. 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。
12. 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。
13. 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。
14. 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。
15. 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。
16. 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。
17. 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。
18. 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。
19. 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。
20. 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。
21. 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。
22. Homology analysis indicated that the protein is identical to the eggshell precursor protein of F.
    同源性分析表明该基因编码蛋白质可能具有肝片吸虫卵壳前体蛋白相似的性质和功能。
23. 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。
24. 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。
25. 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。
26. 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。
27. 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。
28. 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。
29. 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。
30. 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。

noun

1. something that precedes and indicates the approach of something or someone

   Synonym:    harbingerforerunnerpredecessorherald

2. a person who goes before or announces the coming of another

   Synonym:    forerunner

3. a substance from which another substance is formed (especially by a metabolic reaction)