annual ring
柯林斯詞典
1. N a ring of wood indicating one year's growth, seen in the transverse section of stems and roots of woody plants growing in temperate climates 年輪 (Also called tree ring)
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1. N a ring of wood indicating one year's growth, seen in the transverse section of stems and roots of woody plants growing in temperate climates 年輪 (Also called tree ring)