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TOEFL IELTS BNC: 8851 COCA: 7556
cavity
noun [C] /ˈkævəti/
singularcavity
pluralcavities
  1. a hole or space inside a solid object
     Synonyms and related words
    Holes and openings in surfaces: abyss, aperture, blowhole...
    1. a.
      a space inside someone's body (身体的)腔

      the chest cavity 胸腔

       Synonyms and related words
      General regions and organs inside the body: apparatus, canal, cavity...
    2. b.
      a hole in a tooth, caused by decay 龋齿的洞
       Synonyms and related words
      Dentistry: amalgam, brace, bridge...

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