英语词汇“astronomical twilight”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

单词	astronomical twilight
释义	astronomical twilight astronomical twilight See: twilight. astronomical twilight astronomical twilight See twilight. astronomical twilight [‚as·trə′näm·ə·kəl ′twī‚līt] (astronomy) The period of incomplete darkness when the center of the sun is more than 6° but not more than 18° below the celestial horizon. astronomical twilight The period before sunrise and after sunset when sun's center is between 12° and 18° below sea-level horizon. This may be regarded for all practical purposes as synonymous with complete darkness. MedicalSeetwilight
随便看	crude rate of natural increase crudes crude scale crude sewage crudesflot crudesgru crude silk crude split fatty acid crudest crude still crude sulfated glycopeptide fraction crude to customer crude turpentine crude unit crude urine crude vesicle carrier fraction crude yellow scale crudite crudites crudities crudity crudité crudités crudiv crudl

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