| 单词 | annual ring |
| 释义 | annual ring年轮【医】 年轮(植物) annual ring annual ring n.Botany （名词）【植物学】 The layer of wood formed in a plant during a single year. Annual rings appear concentric when viewed in cross section.年轮：一年里树木长出的层。从截面上看年轮呈同心圆状 |
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