You place text and graphics objects on the page with the same postfix syntax as that of the multiplication and addition example above.

在页面中布置文本和图形对象与上文的乘法和加法示例使用的 postfix 语法相同。

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If you could not pop two operators, the syntax of the postfix expression was not correct.

如果您不能够弹出两个操作数，后缀表达式的语法就不正确。

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