| 单词 | nebula |
| 释义 | nebula noun[C] physicsspecializeduk/ˈneb.jə.lə/us/ˈneb.jə.lə/pluralnebulaeornebulasacloudofgasordustinspace,appearingeitherbrightordark 星云 STScI/NASA/Corbis Documentary/GettyImages Astronomy
nebula| American Dictionarynebula noun[C] us/ˈneb·jə·lə/plural-lasor-laeus/ˈneb·jə·li,-ˌlɑɪ/earth science acloudofdustorgasinouterspace: The Orion Nebula isvisibleto thenakedeyeunderdarkskies. nebularadjective[not gradable]earth scienceus/ˈneb·jə·lər/ Examplesofnebulanebula We have shown that for reasonable assumptions regarding the proto-planetarynebula, magnetic reconnection in a dusty plasma can result in localized heating of dust particles. From theCambridge English Corpus The reason for this revisitation lies in the fact that complex organic matter resembling a petroleum fraction may exist in certain protoplanetary nebulae. From theCambridge English Corpus These objects probably retained the prebiotic material present in the pre-solarnebulaand deposited it on our planet. From theCambridge English Corpus More realistically, thenebulawould be evolving under the influence of internal viscous forces and the tidal forces of embedded giant planets. From theCambridge English Corpus Among several sources, gas-grain reactions operating in the solarnebulahave been well recognized to play an important role in nebular chemistry. From theCambridge English Corpus In any event, the physical aspects of the moon, the planets, the nebulae will be able to be studied and charted under favourable conditions. From theCambridge English Corpus The resulting spectrum is able to match the emission spectrum of a protoplanetarynebula. From theCambridge English Corpus These include the 21 and 30 mm emission features, and the extended red emission observed in protoplanetary nebulae and planetary nebulae. From theCambridge English Corpus The constraints for its formation in the solarnebulaare too demanding so it cannot be formed at all under those conditions. From theCambridge English Corpus It has been supposed that the formation of macromolecular material was probably related to thermal alteration in the solarnebulaor the meteorite parent body. From theCambridge English Corpus Star-forming regions within the nebulae encountered may thus be seeded by significant numbers of microorganisms. From theCambridge English Corpus Much of the interstellar gas as well as gaseous nebulae are plasmas. From theCambridge English Corpus An average-size star will then shed its outer layers as a planetarynebula. From theCambridge English Corpus Thus, these petroleum fractions can be used as model for the matter present in the interstellar medium or in the protoplanetary nebulae. From theCambridge English Corpus In this introduction, we have started from the observation that petroleum fractions may exist in certain protoplanetary nebulae. From theCambridge English Corpus 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. CollocationswithnebulanebulaThese are words often used in combination withnebula. Click on a collocation to see more examples of it. emission nebula This is anemissionnebulashowing glowing gas and darker dust lanes. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.planetary nebula An average-size star will then shed its outer layers as aplanetarynebula. From theCambridge English Corpus protoplanetary nebula The resulting spectrum is able to match the emission spectrum of a protoplanetary nebula. From theCambridge English Corpus 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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