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单词 phototonus
释义

WordReference Random House Unabridged Dictionary of American English © 2024
pho•tot•o•nus  (fō totn əs),USA pronunciation n. [Biol.]
  1. the normal condition of sensitiveness to light in organisms or their organs.
  2. the irritability exhibited by cytoplasm when exposed to light of a certain intensity.
  • 1870–75; photo- + tonus
pho•to•ton•ic  (fō′tə tonik),USA pronunciation adj. 
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