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单词 impaction
释义

WordReference Random House Unabridged Dictionary of American English © 2024
im•pac•tion  (im pakshən),USA pronunciation n. 
  1. an act or instance of impacting.
  2. the state of being impacted;
    close fixation.
  3. Dentistrythe condition in which a tooth is impacted.
  • Late Latin impāctiōn- (stem of impāctiō), equivalent. to Latin impāct(us), past participle of impingere (see impacted) + -iōn- -ion
  • 1730–40

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