这就是树木的年轮告诉他的。

The growth rings on a tree tell him.

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但是年轮很小，表明那些树木的生长是极其缓慢的。

But the rings were very small, showing that the trees grew extremely slowly.

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为了对年轮进行研究，研究人员通常会从树木取出一块铅笔大小的核心部分。

To study tree rings, researchers generally take a pencil-sized core from a tree.

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这是因为树木每年都会产生新的年轮。

That's because trees create a new ring each year.

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记载年轮的树木。

The trees full of annual rings.

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记载年轮的树木。

The trees full of annual rings.

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