如输入一个句子，如果该句子合法则输出与句子对应的语法树；能够输出分析过程中每一步符号栈的变化情况。
As input a sentence, if the sentence is lawful sentence corresponding output syntax tree to the output of the process every step of the sign changes in the stack.
如输入一个句子，如果该句子合法则输出与句子对应的语法树；能够输出分析过程中每一步符号栈的变化情况。
As input a sentence, if the sentence is lawful sentence corresponding output syntax tree to the output of the process every step of the sign changes in the stack.
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