| 词汇 | penumbra |
| 释义 | penumbra noun[ C or U ] physics specializeduk /pɪˈnʌm.brə/ us /pɪˈnʌm.brə/ a part of a shadow in which only some of the light is blocked, used especially about a shadow made during an eclipse: （日食、月食等的）半影 In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays.月食发生时，外侧的暗影或称半影是地球把部分太阳光挡住了的区域。 IgorKovalchuk /iStock/Getty Images Plus/GettyImages Darkness & becoming dark blackness darken darkened darkness dim dimly dimness dingily dingy inky pitchy plunge someone/something into darkness semi-darkness shade shaded shadily shadow silhouette silhouetted twilight You can also find related words, phrases, and synonyms in the topics: Astronomy Examples of penumbrapenumbra The moon was completely within the penumbra for half an hour and remained partially in eclipse for nearly two hours. This is sometimes referred to as the 'ischaemic penumbra'. A substantial penumbra had abandoned church membership or retained only the most tenuous of links. The construction of the shield is described and the results of transmission and penumbra measurements are given. Thus, the prime goal of neuroprotection has been to salvage the ischaemic penumbra and thereby limit the extent of damage. The width of the penumbra and the distance of the edge of the optical field from the 50% isodose level were measured at a number of points. These pathological processes may increase the area of cellular damage but the goal of treatment is to preserve potentially viable cells within the so-called ischaemic penumbra. Following a stroke there is a region surrounding the core of the insult known as the penumbra zone in which the tissue can survive for a period of time. There is an inherent inaccuracy in this method in that the penumbra impedes the accuracy to which the beam edge and subsequent centre of the field can be determined. Dworkin's critique, in its new and reduced guise, reinstates the core/penumbra distinction that has always been to the liking of positivists. These borderline cases comprise a "penumbra of uncertainty" with respect to the applicability of a general term; it is this penumbra of uncertainty that forms the term's open texture. The penumbra of patronage is even more dangerous than the patronage itself. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 I do not want to see any such penumbra effect for 16 and 17-year-olds. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Indeed, the district rate covers only the penumbra of services. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 We have witnessed a display of openness conducted in a strange penumbra of secrecy. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 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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