单词	reverse Polish notation
释义	reverse Polish notation noun : a system of representing mathematical and logical operations in which the operands precede the operator and which does not require the use of parentheses (3 + 5) − (2 + 1) in reverse Polish notation is expressed as 3 5 + 2 1 + − called also postfix notation Word History First Known Use 1957, in the meaning defined above
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