precursor
n. 先驱，前导
n.
前辈，前驱，先锋，前任；预兆，先兆，初期形式；[核]前驱波，初级粒子；预报器
变形
复数：precursors
英英释义
precursor[ pri:'kə:sə, pri- ]
n.
a substance from which another substance is formed (especially by a metabolic reaction)
a person who goes before or announces the coming of another
同义词：forerunner
an indication of the approach of something or someone
同义词：harbingerforerunnerherald
词组短语
precursor chemicals易制毒化学品
双语例句
用作名词(n.)
The precursor of the modern car was a horseless carriage with a petrol engine.
现代汽车的前身是不用马拉的，装有汽油发动机的车子。
Her precursor as school principal was an eminent educator.
她任校长前是一位卓越的教育家。
Opposition by colonists to unfair taxation by the British was a precursor of the Revolution.
殖民地居民对英国不公正税收的反抗预示着革命的到来。
Lysine is a precursor of certain alkaloids.
赖氨酸是某些生物碱的前体。
权威例句
The precursor of Alzheimer's disease amyloid A4 protein resembles a cell-surface receptorDetermination of malonaldehyde precursor in tissues by thiobarbituric acid test.
Human tumour necrosis factor: precursor structure, expression and homology to lymphotoxin
β-Secretase Cleavage of Alzheimer's Amyloid Precursor Protein by the Transmembrane Aspartic Protease BACE
Segregation of a missense mutation in the amyloid precursor protein gene with familial Alzheimer's disease.
Alzheimer-type neuropathology in transgenic mice overexpressing V717F β-amyloid precursor protein
Tyrosine 687 phosphorylated Alzheimer's amyloid precursor protein is retained intracellularly and exhibits a decreased turnover rate
The ubiquitinproteasome pathway is required for processing the NF-κB1 precursor protein and the activation of NF-κB
ChemInform Abstract: Formation of High㏎uality CdTe, CdSe, and CdS Nanocrystals Using CdO as Precursor.
Impaired recruitment of bone-marrow-derived endothelial and hematopoietic precursor cells blocks tumor angiogenesis and growth.
precursor
precursor: see course
precursor (n.)
early 15c., from Middle French precurseur and directly from Latin praecursor "forerunner," agent noun from past participle stem of praecurrere, from prae "before" (see pre-) + currere "to run" (see current (adj.)). Related: Precursory.
1. The models may be developed as a precursor to implementing the physical system, or they may be derived from an existing system or a system in development as an aid to understanding its behavior.
模型也可以作为实现物理系统的先驱被开发，或者模型可以根据一个已存在的系统或者开发中的系统被产生作为理解系统行为的帮助手段。
www.ibm.com
2. As such, this question is as old as SGML, the precursor of XML, and has been hotly debated with no universally accepted consensus.
这个问题像XML的先驱SGML一样古老，而且曾经历过热烈的辩论，只是最后也没有广泛地达成一致。
www.ibm.com
3. Tryptophan is an essential amino acid that acts as a precursor of serotonin – the feel-good chemical – and can be converted to melatonin, eliciting relaxation and pleasure.
色氨酸 ，一种非常重要的氨基酸，也是血清素（让人感觉良好的化学物质）的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。
article.yeeyan.org
4. In the UK, "traffic shaping" can similarly be seen as a precursor to wider tiers of internet use with ISPs commonly demoting and even blocking P2P traffic, for example.
在英国，“通信流整形”被近似认为是利用网络服务供应商普遍降级——举个例子——甚至阻止P2P传输来细分互联网应用等级的先驱。
article.yeeyan.org
5. Corporations have had the precursor of social networks for ages.
很长时间以来，企业都是社会化网络应用的先驱。
blog.sina.com.cn
6. Requirements management is a precursor to the bulk of the testing effort, providing a significant amount of test motivation and validation needs.
需求管理是大多数测试工作的先驱，提供了大量的测试动机和确认需求。
www.ibm.com
7. Some even claim the third book, Titus Alone, to be a precursor to the science fiction subgenre of steampunk.
有人甚至声称这第三本书是蒸汽朋克自然小说亚流派的先驱。
article.yeeyan.org
8. Westwood is always the precursor of the punk revolution after all, whose goal is to challenge the traditional raiment of the fashion world.
韦斯特伍德始终是朋克革命的先驱者，她的目标就是向时装界的传统服饰挑战。
www.elanso.com
9. And so, you make not only water vapor, NOX but you make some nitrous oxides, NOX, or nox as it is known, and this is the precursor to smog.
这样不仅仅得到的水蒸气，但是你会得到一些氮氧化物，或者如大家所知到的nox，这是烟雾的前驱体。
dict.youdao.com
10. The idea that any country may take action against pirates is the precursor to the idea of “universal jurisdiction” used to prosecute heinous crimes such as genocide.
任何国家都有权采取行动对抗海盗的理念也是“普遍管辖权”的前身（这种权利被用来起诉一些极恶的罪行，如种族灭绝）；
blog.ecocn.org
11. U.S. officials also recognize that acute hunger and malnutrition can be the precursor for disease outbreaks.
美国官员们也认识到，严重的饥饿和营养不良可能是疾病暴发的前兆。
iipdigital.usembassy.gov
12. Hence, choosing the right team is a precursor to all the above factors.
因此，选择一个正确的团队是上述一切因素的先决条件。
www.infoq.com
13. In fact, the new yeast strain simultaneously converts cellobiose (a precursor of glucose) and xylose to ethanol just as quickly as it can ferment either sugar alone.
这种新酵母可以同时将葡萄糖的前身纤维二糖和木糖转化为乙醇，其速度与单独发酵任一糖类一样快。
article.yeeyan.org
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。
www.scidev.net
15. The company has provided similar support to the ASC and its precursor organization, the Army Field Support Command, for the past six and one-half years, the officials said.
该官员说，该公司在过去的六年半时间内还为ASC和其前身组织陆军野战支援司令部提供类似的支持。
www.etiri.com.cn
16. Is Watson, despite its limitations, nonetheless a precursor to a HAL-esque machine that can "mimic" natural language, if not "reproduce" it?
忽略其限制因素，如果不能实现复制再现，那么单单在模仿人类语言上，沃森会是哈尔的前身吗？
article.yeeyan.org
17. In 1621, the Pilgrims sat down with a group of Native Americans for a harvest feast — the precursor to the Thanksgiving holiday we celebrate today.
1621年，清教徒与一群美洲印第安人坐在一起，举行一个丰收宴会——我们今日所庆祝的感恩节的前身。
article.yeeyan.org
18. The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.
结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。
article.yeeyan.org
19. The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.
结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。
article.yeeyan.org
20. The immediate transcript of a t RNA gene is known as precursor tRNA.
tRNA基因的直接转录物叫做tRNA前体。
-- 来源 -- 英汉 - 辞典例句
21. Difunctionality, which is the essential characteristic of a polymer precursor, may be achieved in many different ways.
能生成聚合物的物质其不可缺少的特点是具有双官能性。这种双官能性可用多种方法获得。
-- 来源 -- 英汉 - 辞典例句
22. 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。
-- 来源 -- 英汉 - 辞典例句
23. 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。
-- 来源 -- 英汉 - 辞典例句
24. Most dolomite is obviously the result of replacement of precursor calcite but certainly not all.
多数白云石显然是原来方解石交代的结果，但肯定不是全部。
-- 来源 -- 英汉 - 辞典例句
25. Exogenously supplied aspartate is not an active precursor of asparagine in plant tissurs.
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。
-- 来源 -- 英汉 - 辞典例句
26. 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。
-- 来源 -- 英汉 - 辞典例句
27. Crazing is the invariable precursor of brittle fracture.
出现小裂纹必然是脆性断裂的前兆。
-- 来源 -- 英汉 - 辞典例句
28. Thiophene, a highly common substance, serves as a versatile precursor to a variety of amino acids.
噻吩是一种很普通的物质，它可以作为合成各种氨基酸的母体。
-- 来源 -- 英汉 - 辞典例句
29. In the past this had been the precursor to strong decisions.
要是在过去，这就是要采取强力行动的预兆。
-- 来源 -- 英汉 - 辞典例句
precursor
