amphitheatre
  圓形劇場;階梯式
  Am·phi·the·a·ter, Am·phi·the·a·tre, n.
  1. An oval or circular building with rising tiers of seats about an open space called the arena.
  Note: ☞ The Romans first constructed amphitheaters for combats of gladiators and wild beasts.
  2. Anything resembling an amphitheater in form; as, a level surrounded by rising slopes or hills, or a rising gallery in a theater.
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  amphitheatre
       n 1: a sloping gallery with seats for spectators (as in an
            operating room or theater) [syn: amphitheater]
       2: an oval large stadium with tiers of seats; an arena in which
          contests and spectacles are held [syn: amphitheater, coliseum]