单词	annual ring
释义	annual ring noun : the layer of wood produced by a single year's growth of a woody plant Example Sentences Recent Examples on the Web Under ideal conditions, trees grow quickly, leaving wide annual rings behind. Erin Blakemore, National Geographic, 8 July 2019 Tree rings are particularly diligent record-keepers, recording rainfall in their annual rings; ice cores can keep exquisitely detailed accounts of seasonal conditions going back nearly a million years. Rachel E. Gross, Smithsonian, 16 Apr. 2018 Word History First Known Use 1681, in the meaning defined above Kids Definition annual ring noun : the layer of wood produced by one year's growth of a woody plant (as in the trunk of a tree)
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