cav·i·ty /ˈkævəti/
  洞,空穴,腔
  cav·i·ty /ˈkævətɪ/ 名詞
  腔,(空)洞
  cavity
  空腔
  Cav·i·ty n.; pl. Cavities
  1. Hollowness. [Obs.]
     The cavity or hollowness of the place.   --Goodwin.
  2. A hollow place; a hollow; as, the abdominal cavity.
     An instrument with a small cavity, like a small spoon.   --Arbuthnot.
     Abnormal spaces or excavations are frequently formed in the lungs, which are designated cavities or vomicæ.   --Quain.
  Body cavity, the cœlum. See under Body.
  ◄ ►
  cavity
       n 1: a sizeable hole (usually in the ground); "they dug a pit to
            bury the body" [syn: pit]
       2: space that is surrounded by something [syn: enclosed space]
       3: soft decayed area in a tooth; progressive decay can lead to
          the death of a tooth [syn: caries, dental caries, tooth
          decay]
       4: (anatomy) a natural hollow or sinus within the body [syn: bodily
          cavity, cavum]