如果科学家弄清楚什么样的温度和湿度最适合树木生长，他们就可以推算出那一年的气候情况。

If scientists know what temperature and moisture level make the tree happy, they can use the thickness to gauge what the climate was like that year.

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事实上，树木腐烂的自然过程可以使土壤变得肥沃，更适合以后树木的生长。

In fact, the natural process of wood decomposition enriches the soil and makes it more suitable for future generations of tree.

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事实上，树木腐烂的自然过程可以使土壤变得肥沃，更适合以后树木的生长。

In fact, the natural process of wood decomposition enriches the soil and makes it more suitable for future generations of tree.

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