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1. Oxford Dictionary

   annulus

   • IPA[ˈanjʊləs]

   英式

   • n.
     a ring-shaped object, structure, or region.；a plane figure consisting of the area between a pair of concentric circles.

   • noun: annulus, plural noun: annuli

2. • 更多解釋

   annulus

   • IPA[ˈanyələs]

   美式

   • n.
     a ring-shaped object, structure, or region.

   Oxford American Dictionary