You can tell the age of a tree by counting its rings, but these records of trees' life really say a lot more.

你可以通过数年轮来判断树木的年龄，但是作为树木生命的记载，年轮能说明的东西远不止于此。

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So, by measuring the ratio of the two isotopes in the rings of trees, and matching the result to the age of the ring, a history of hurricanes spanning the life of the tree can be reconstructed.

因此，通过测量树的不同年轮(ring)中两种氧同位素的比例，并将结果比对年轮所显示的树龄，就可再现树木一生中所经历的所有飓风。

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They're a bit like tree rings, and you can count those ridges and it basically gives you the age of the animal.

他们有点像树的年轮，可以数那些条纹，基本上它会告诉你这个动物的年龄。

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