然后给出了与频繁子树有关的概念，区分了嵌入子树和直接子树，定义了同构交叠子树和最小性。

Then the paper formulates related notions of frequent sub tree, distinguishes embedded sub tree from direct sub tree, and defines isomorphic overlapped sub tree and minimum.

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然后给出了与频繁子树有关的概念，区分了嵌入子树和直接子树，定义了同构交叠子树和最小性。

Then the paper formulates related notions of frequent sub tree, distinguishes embedded sub tree from direct sub tree, and defines isomorphic overlapped sub tree and minimum.

youdao