| 词汇 | precursor |
| 释义 | precursor noun[ C ] formaluk /ˌpriːˈkɜː.sər/ us /ˌpriːˈkɝː.sɚ/ something that happened or existed before another thing, especially if it either developed into it or had an influence on it: 先驱，先锋;先兆，前兆 Sulphur dioxide is the main precursor of acid rain.二氧化硫是形成酸雨最重要的先决条件。 Biological research has often been a precursor to medical breakthroughs.生物学研究往往是医学突破的先驱。 Preceding and introducing announce antedate beat build (someone/something) up countdown curtain-raiser emcee forerunner introduce introduction introductory lead up to something lead-in preamble preface prefix preliminarily preliminary prelude reintroduce precursor | American Dictionaryprecursor noun[ C ] us/prɪˈkɜr·sər, ˈpriˌkɜr-/ something that comes before another and may lead to it or influence its development: Opponents fear this would be a precursor to development of the entire canyon. Examples of precursorprecursor During lignification, phenyl rings of lignin precursors align to the cellulose molecule surfaces in a controlled and ordered process. A set of precursors to cluster acquisition was thereby identified and shown to be recursive. Understanding the ratio of precursor types in the population might be useful therapeutically. These particles were prepared from molecular precursors combined with a surface modification agent either by a photolytic or a thermal nucleation and growth step. Proliferation of granule cell precursors in the dentate gyrus of adult monkeys is diminished by stress. Multiple proteases may also be involved in the degradation of the many protein precursors found in the developing seed. This was the precursor to a remarkable series of events. This board would be the precursor to the local advisory boards that would later play a key role in managing the public grasslands. Another behavioral precursor of disorganized attachment might be frightening parental behavior in the absence of maltreatment. Pain, in particular, was found to be a significant precursor to the development of such disorders. The electron number density profiles for the plasma around the wires, in the radial streams, and in the precursor are also in close agreement. In this enterprise of crossings and crossovers can be discerned the precursors of the hybrid genres now prominent in our own time. Utilizing methanol and ethanol as the primary organic precursors, catalytic reaction products observed include alkanes, branched-phenyl compounds, carboxylic acids, and methyl-esters. The precursor is in fact confined by the continuous bombardment of plasma from the radial streams. They already contained coarse electron-dense granules - the presumed precursor substance for the crystalline material. See all examples of precursor These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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