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1. Oxford Dictionary

   annual ring

   • n.
     a ring in the cross section of the stem or root of a temperate woody plant, produced by one year's growth.

   • noun: annual ring, plural noun: annual rings

2. • 更多解釋

   annual ring

   • IPA[ˈany(əw)əl riNG]

   • n.
     another term for tree ring

   Oxford American Dictionary