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词汇 growth ring
释义

growth ring

noun
/ˈɡrəʊθ rɪŋ/
/ˈɡrəʊθ rɪŋ/
  1. a layer of wood, shell or bone developed in one year, or in another regular period of growth, that an expert can look at to find out how old something is(树木、壳或骨等的)生长轮,年轮
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