| 单词 | altostratus |
| 释义 | altostratus noun[U] environmentspecializeduk/ˌæl.təʊˈstrɑː.təs/us/ˌæl.toʊˈstreɪ.t̬əs/atypeofstratus(= aflat,greycloud)formedinthinlayersandfoundatmediumheight, above thelevelofstratus 层云（灰白成层的云雾，见于中等高度）Compare cirrostratus nimbostratus  John Lawson/Moment/GettyImages Precipitation: clouds, dew, fog & steam
Examplesofaltostratusaltostratus Often, when analtostratuscloud thickens and descends into lower altitudes, it will become nimbostratus. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.This cloud typically forms fromaltostratusin the middle altitude range, but it tends to thicken into the low altitude range during precipitation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The variety "undulatus" (having a wavy undulating base) can occur with any clouds of the species stratiformis or lenticularis, and withaltostratus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Altostratusand nimbostratus clouds always have this physical appearance without significant variation or deviation and, therefore, do not need to be subdivided into species. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.They also can occur underaltostratuscloud preceding a warm or occluded front, when cumulus usually lose vertical development as the sun's heat decreases. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Thealtostratusvelum cloud appears dark in comparison to its parent cloud, and can persist even after the cumulonimbus has disintegrated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.A further thickening of thealtostratusis often accompanied by virga and the arrival of precipitation is imminent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.However, only two are seen withaltostratusand stratus nebulosus whose uniform structures prevent the formation of a perlucidus variety. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The best-known is cumulonimbus with mammatus, but the mamma feature is also seen occasionally with cirrus, cirrocumulus, altocumulus,altostratus, and stratocumulus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Altostratusis usually composed of water droplets but may be mixed with ice crystals at higher altitudes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These include middle-tage layers of "altocumulus" and "altostratus" as well as low "stratocumulus", and "stratus". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.If the precipitation increases in persistence and intensity, thealtostratuscloud may thicken into nimbostratus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The sun can be seen through thinaltostratus, but thicker layers can be quite opaque. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Fractonimbus exist only under precipitation clouds (such as nimbostratus,altostratusor cumulonimbus), and don't produce precipitation themselves. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Highaltostratusclouds and night flying conditions prevented him from making any visual contact. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.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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