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单词 growth ring
释义 growth ringBrE /ˈɡrəʊθ rɪŋ/NAmE /ˈɡroʊθ rɪŋ/ nouna 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 sth is (树木、壳或骨等的)生长轮,年轮
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