人生如同一丝游云，一片落叶；云与天宇的相栖是暂短的，叶与树相依是匆匆的。

Life is like a trace of roaming cloud, and also like a piece of fallen leaf; cloud perched with sky is transient and leaf depended on tree is in a rush.

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现有的分类预测的方法有许多种，常见的有决策树算法(C4.5)、贝叶斯分类算法、BP算法与支持向量机等。

There are many classification methods to forecast such as decision tree algorithm (C4.5), Bayes algorithm, BP algorithm and SVM.

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群落的树冠分布图树冠深度为树高与叶下高的差值。

Crown distribution diagram of the community. The crown depths were the difference between tree height and height of lowest leaves.

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