pho·to·chem·is·try /-ˈkɛməstri/
  光化學
  pho·to·chem·is·try /-ˈkɛməstrɪ/ 名詞
  光化學
  photochemistry
  光化學
  Pho·to·chem·is·try n.  Chem. The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.
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  photochemistry
       n : branch of chemistry that deals with the chemical action of
           light