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1. Oxford Dictionary

   growth ring

   英式

   • n.
     a concentric layer of wood, shell, or bone developed during an annual or other regular period of growth.

   • noun: growth ring, plural noun: growth rings

2. • 更多解釋

   growth ring

   • IPA[ˈɡrōTH ˌriNG]

   美式

   • n.
     a concentric layer of wood, shell, or bone developed during an annual or other regular period ...

   Oxford American Dictionary