After the trees are felled, many concentric rings can be seen on the stumps, which are called rings in botany. Tree rings are formed by the influence of seasons in the growth process of trees, and they are produced once a year. Spring timber and autumn timber of the same year are collectively called rings. The first year`s autumn timber and the second year`s spring timber are clearly demarcated and become annual rings, indicating the turning point of annual growth alternation of timber. So from the number of rings at the base of the trunk, we can know the age of the tree.

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