| 单词 | silica |
| 释义 | silica noun[U] uk/ˈsɪl.ɪ.kə/us/ˈsɪl.ɪ.kə/amineralthatexistsinvariousforms,includingsand,quartz, andflint, used to makeglassandcement 硅石，二氧化硅Geology: types of rock
Examplesofsilicasilica Conodonts and brachiopods are usually preserved as moulds or replaced bysilica. From theCambridge English Corpus Thesilica'fusion crust' from the associated sample holder exhibited a significant degree of isotopic exchange with atmospheric oxygen during re-entry1. From theCambridge English Corpus The air was dried to zero relative humidity by passing it through two columns ofsilicagel. From theCambridge English Corpus The results are shown in table 1 together with some physical properties of thesilicadusts. From theCambridge English Corpus The ostracod valves recovered have been replaced by finely to coarsely crystallinesilica, which has preserved the original morphology and in some cases the ornament. From theCambridge English Corpus The two planes intersect along cd which is the locus of liquids in equilibrium with asilicapolymorph + two feldspars + aqueous fluid. From theCambridge English Corpus Small amounts of calcite and dolomite can appear sporadically insilicaxenoliths, but are more common in calc-silicate xenoliths. From theCambridge English Corpus Seeds were dried for 2 weeks oversilicagel before sugar extraction. From theCambridge English Corpus The major-element geochemistry confirms the very high levels ofsilicain all the clasts analysed, and their general granitic nature. From theCambridge English Corpus The section on thesilicaminerals covers 152 pages (in the first edition it was 52 pages), including 25 pages of references. From theCambridge English Corpus This book is aimed at this popular market and is lavishly illustrated, but also contains something for the professional interested in the formation ofsilica. From theCambridge English Corpus In these veins, very high degrees of fractional crystallization are reached, producing interstitialsilica-rich glasses. From theCambridge English Corpus However, they are probably mainly composed ofsilicaand are postulated to have a similar origin to category 1a types. 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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