指令push和QUEUE对应的是对栈的LIFO和FIFO操作。
The instructions PUSH and QUEUE correspond to LIFO and FIFO operations on the stack.
指令PULL或者PARSE PULL从栈顶取得一个字符串。
The instruction PULL or PARSE PULL take a string off the top of the stack.
Rexx中有一些指令可以显式地指定要操作的栈；但是其他指令操作是在您用ADDRESS指令配置的环境中进行。
Some instructions in Rexx may explicitly specify a stack to operate on; but other instructions operate within an environment which you configure with the ADDRESS instruction.
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