| 词汇 | umbra |
| 释义 | umbra noun[ C or U ] physics specializeduk /ˈʌm.brə/ us /ˈʌm.brə/pluralumbras or or umbrae the dark inner part of a shadow in which all light is blocked, used especially about a shadow made during an eclipse荫;阴影;（尤指日食发生时的）本影，暗影 Compare penumbra Darkness & becoming dark blackness darken darkened darkness dim dimly dimness dingily dingy inky pitch darkness pitchy plunge someone/something into darkness semi-darkness shade shaded shadow silhouette silhouetted twilight You can also find related words, phrases, and synonyms in the topics: Astronomy Examples of umbraumbra At one extreme, in the umbrae of sunspots and pores, where the imposed field is strong and almost vertical, normal convection is substantially inhibited. The diameter of the umbra does not decrease appreciably within the changes in the orbital distance of the moon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Umbra is a being entirely composed of light, in nature and essence. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For a point source only the umbra is cast. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Umbra was never actually shown in any of the issues. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An observer in the antumbra, the area of shadow beyond the umbra, will see an annular eclipse. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is a narrow path for the moon to pass within the penumbra and outside the umbra. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The spacecraft systems, and the scientific instruments, are located in the umbra of the shield. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Within the umbra, there is no direct solar radiation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Umbra, a world record-holding dog, can swim 4 miles (6.4 km) in 73 minutes, placing her in the top 25% in human long-distance swimming competitions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The word is formed of the privative particle ", and", ("umbra", shadow). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The second umbra fought, and uses ice. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Umbra was not among these escapees. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are three distinct parts of a shadow created by any non-point light source after impinging on an opaque object called the umbra, penumbra and antumbra. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An alternative definition is that the penumbra is the region where "some or all" of the light source is obscured (i.e., the umbra is a subset of the penumbra). 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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