| 释义 |
- 树木年轮：树木横截面上的环状结构，用于确定树木的年龄和生长历史。
1 ?树轮 青海杂多圆柏年轮指示的近700年旱涝变化_stmopen 关键词】: 青海 杂多 树轮 干燥度指数 [gap=1200]Keywords】: Qinghai,Zaduo,Tree-rings,Drought index
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Replacement can be a marvelously precise process, so that details of shell ornamentation, tree rings in wood, and delicate structures in bone are accurately preserved. 替换可能是一个令人惊叹的精确过程，因此贝壳纹饰的细节，树木的年轮和骨的微妙结构都被准确地保存。 - 2
Ten thousand years of tree rings show that the carbon-14 level rises and falls about every 420 years. 一万年的树木年轮显示，碳14水平大约每420年上升和下降一次。 - 3
For the time before records began, we have only "proxy records" reconstructed largely from tree rings and ice cores, supplemented by a few incomplete written accounts. 在开始有记录之前，我们只有主要根据年轮和冰芯重建的“代理记录”，还有一些不完整的书面记录作为补充。
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