Initialize an empty stack and empty result string variable.

初始化一个空堆栈，将结果字符串变量置空。

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State 0 represents the empty stack, state 1 represents the stack with only one element: simpara.

状态0表示空堆栈，状态1表示只有一个元素：simpara的堆栈。

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The equivalence of acceptance words by PDLA with final state and with empty stack is proved.

下推格值自动机以终态与以空栈两种接受词语言的方式是等价的。

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At the scene a man with a big forehead, gray hair, a flat nose, and a few missing teeth lay on the sidewalk, next to a stack of books and an empty coffee-cup.

FORBES: Santa Arrived Too Late