这是一个有限、已标记、导向的树状结构，其中的内部节点会标示运算子，而分叶节点则代表节点运算子的运算元。
It is a finite, labeled, directed tree in which the internal nodes are labeled by operators, and the leaf nodes represent the operands of the node operators.
这是一个有限、已标记、导向的树状结构，其中的内部节点会标示运算子，而分叶节点则代表节点运算子的运算元。
It is a finite, labeled, directed tree in which the internal nodes are labeled by operators, and the leaf nodes represent the operands of the node operators.
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