attenuate       
verb [ T ]  formal uk/əˈten.ju.eɪt/ us/əˈten.ju.eɪt/
 使减少;使减弱;使降低
to make something smaller, thinner, or weaker
  Radiation from the sun is attenuated by the earth's atmosphere. 地球大气减弱了太阳辐射。 
 
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