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单词 ultrashort
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ul•tra•short  (ul′trə shôrt),USA pronunciation adj. 
  1. Radio and Televisionextremely short.
  2. Radio and Television, Physics(of a wavelength) smaller than 10 meters.
  • ultra- + short 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::
ultrashort /ˌʌltrəˈʃɔːt/ adj
  1. (of a radio wave) having a wavelength shorter than 10 metres
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