| 单词 | pumice |
| 释义 | pumice noun[U] uk/ˈpʌm.ɪs/usatypeofgrey,lightstonethat is used inpiecesor as apowderforrubbingthings to make themsmooth: 浮石，轻石（用来摩擦物体使其光滑）Pumice isproducedinvolcaniceruptions.浮石是在火山爆发中产生的。  DonNichols/iStock/Getty Images Plus/GettyImages Geology: types of rock
Examplesofpumicepumice Concentrations ofpumiceclasts towards the base form trains of clasts that are traceable along the length of outcrops. From theCambridge English Corpus Concentrations of accretionary lapilli and diffuse trains of small pumices define bedding in this thick ash bed. From theCambridge English Corpus For selected ignimbrites, sanidine crystals were taken from fresh, unalteredpumicelapilli. From theCambridge English Corpus Due to incomplete exposures, the dispersal characteristics of mostpumicefallout deposits are poorly constrained. From theCambridge English Corpus Widely dispersed plinian-typepumicefall deposits and ignimbrite are characteristic products of both explosive cycles. From theCambridge English Corpus Lithic- andpumice-rich horizons may mark separate eruptive events. From theCambridge English Corpus The presence of bandedpumicenear the top defines a compositional zonation of the ignimbrite. From theCambridge English Corpus These tuffs are all considered to be ash flow deposits because they are unbedded and contain well-developed eutaxitic foliation andpumicepseudomorphs locally. From theCambridge English Corpus In the sixth zone, an abrupt change to greyishpumiceis encountered, and no crystals are seen. From theCambridge English Corpus Particle-supported autotrophic biofilms were cultivated in external-loop airlift reactors at differentpumiceconcentrations. From theCambridge English Corpus Concentrations ofpumiceoccur locally in the upper 20-30 cm of the ignimbrite. From theCambridge English Corpus Lithic fragments are commonly embedded in the larger pumices. From theCambridge English Corpus The alkali basalt lithic breccias pass abruptly upwards into bandedpumice-bearing ignimbrite. From theCambridge English Corpus The internal structure of the bedforms is massive, although openwork clusters ofpumiceoccur at the crest and on the lee-side. From theCambridge English Corpus For this purpose biofilms were grown as autotrophic and heterotrophic communities onpumicein an airlift loop reactor. 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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