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单词 penumbra
释义 pen·um·braBrE /pəˈnʌmbrə/NAmE /pəˈnʌmbrə/ noun (specialist) an area of shadow which is between fully dark and fully light (黑暗与光明之间的)半影(astronomy 天文学) the shadow made by the earth or the moon during a partial eclipse (偏食期间的)半影   compare umbra
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