| 词汇 | polar-night |
| 释义 | polar night noun[ C or U ] uk /ˌpəʊ.lə ˈnaɪt/ us /ˌpoʊ.lɚ ˈnaɪt/ a night or the time in winter at places close to the North or South Pole, when the sun does not appear above the horizon极夜 Days & times of day afternoon afternoons all day am arvo happy hour high noon hour in broad daylightidiom in the dead of night/winteridiom night noon noontime o'clock office hours opening time the witching hour twilit workday working day Examples of polar nightpolar night A woman in the polarnight. Activity is at a stand-still during the polarnight, which lasts for many months. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Inside the polarnight jet is the polar vortex. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Below this barrier exists the polarnight jet, which is weak in the early winter, so any descending polar air mixes with the mid-latitudes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Further, there is no interference from the sun in the millimeter range during the months of polarnight. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, at the outer boundary of the polar vortex, in winter, the stratospheric polarnight jet exists. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each kind of polarnight is defined as when it's darker than the corresponding kind of twilight. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The opposite phenomenon, polarnight, occurs in winter when the sun stays below the horizon throughout the day. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During the astronomical polarnight stars of the sixth magnitude, which are the dimmest stars visible to the naked eye, will be visible throughout the entire day. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is called a polarnight. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. That is the polarnight. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These areas either receive sunlight (midnight sun) or shade (polarnight) 24 hours a day because of the earth's tilt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Polarnight and midnight sun last about 3 months per year on the south and 5 months on the north. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The flora benefits from the long period of midnight sun, which compensates for the polarnight. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The sun shines 24 hours in the summer, and barely ever shines at all in the winter (see midnight sun and polarnight). 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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