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umbra

noun
/ˈʌmbrə/
/ˈʌmbrə/
(plural umbras, umbrae
/ˈʌmbriː/
/ˈʌmbriː/
)
(specialist)
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  1. the darkest part of a shadow本影(影子中光源完全照射不到的部分)
  2. the area on the earth or the moon that is the darkest during an eclipse(日食或月食期间地球或月球的)本影 compare penumbra
  3. Word Originlate 16th cent. (denoting a phantom or ghost): from Latin, literally ‘shade’.

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