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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波兰表示力争在2011年前达到加入欧元区标准，制定兹罗提(波兰货币)兑欧元固定汇率。

Poland, ambitiously, says it wants to meet the criteria and set a fixed rate for the zloty against the euro in 2011.

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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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