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单词 brightness
释义

WordReference Random House Unabridged Dictionary of American English © 2024
bright•ness  (brītnis),USA pronunciation n. 
  1. the quality of being bright.
  2. Opticsthe luminance of a body, apart from its hue or saturation, that an observer uses to determine the comparative luminance of another body. Pure white has the maximum brightness, and pure black the minimum brightness.
  • Middle English brihtnes, Old English beorhtnes. See bright, -ness bef. 950

Collins Concise English Dictionary © HarperCollins Publishers::
ˈbrightness /ˈbraɪtnɪs/ n
  1. the condition of being bright
  2. a former name for luminosity
  3. the experienced intensity of light
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