In my code the evaluation is performed by each AST node itself, but we may use also a tree walker to walk each node and execute it based on its type.
在我的代码中，计算由每个AST结点自己执行，但我们可能也将使用一个树遍历器来遍历每个结点，基于它的类型来执行。
The walnut nolid moth, Nola distributa Walker, is a major pest of walnut tree in the vicinity of Peking.
核桃瘤蛾是北京市郊区核桃树的主要害虫之一。
The life-history and habits of Samia Cynthia walker er Felder infesting camphor tree have been studied during 1999-2000 in shanghai.
2000年研究了上海地区危害樟树的樗蚕生活史和生活习性。
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