Read the postfix expression from left to right.
从左到右读入后缀表达式
At the end of the postfix expression, pop a result from the stack.
到后缀表达式末尾，从堆栈中弹出结果。
If the postfix expression was correctly formed, the stack should be empty.
若后缀表达式格式正确，那么堆栈应该为空。
The second form is a postfix decrement operation.
第二种形式是后缀减量操作。
The second form is a postfix increment operation.
第二种形式是后置的递增运算。
This is the postfix version of the decrement operator.
这是递减运算子的后置版本。
The result of the postfix increment expression is not a variable, but a value.
后+ +符表达式的结果是个值而不是一个变量。
As a result, Postfix is generally accepted as a more secure program than Sendmail.
结果，Postfix通常被认为是比Sendmail更安全的程序。
As a result, Postfix is generally accepted as a more secure program than Sendmail.
结果，Postfix通常被认为是比Sendmail更安全的程序。
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