下一条指令的地址(Next Instruction Reference)：指明下一条要运行的 指令的位置，一般指令是按顺序依次执行的，所以绝大多数指令中 并不显示的指明下一条指令的地址，也就是说...
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如果此堆栈帧处于非活动状态，则该偏移量将是在重新激活该堆栈帧后要执行的下一条指令的地址。
If this stack frame is not active, the offset is the address of the next instruction to be executed when the stack frame is reactivated.
在程序执行Storage Access或Branch指令或者在存取下一条顺序指令时，它将使用处理器计算出的有效地址引用存储设备。
A program references storage using the effective address computed by the processor when it executes a storage Access or Branch instruction or when it fetches the next sequential instruction.
包含下一条要执行指令地址的处理器中的寄存器。也叫程序计数器。
A register in the processor that contains the address of the next instruction to be executed. Also known as a program counter.
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