评价一个用逆波兰表示法写成的算法式子的价值。

Evaluate the value of an arithmetic expression in Reverse Polish Notation.

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后缀表示法也称逆波兰表示法(reverse Polish notation, RPN)，因其使表达式求值变得轻松，所以被普遍使用。

Postfix notation is also known as reverse Polish notation (RPN) and is commonly used because it enables easy evaluation of expressions.

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