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。
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.
接着是一匹活马勇敢地与水搏击。但我们担心，洪水的力量将使它上岸之前就筋疲力尽了。
Bravely exhausted Next came a horse, swimming bravely, but we were afraid that the strength of the current would prevent its landing anywhere before it became exhausted.
但我知道我将使它通过，如果你等我。
但我知道我将使它通过，如果你等我。
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