The part of execution in which an operand or instruction is read from main storage and written into a control unit or arithmetic unit register.
执行过程中的一个阶段所需的时间，在此期间，计算机从主存储器中取出指令或操作数，并将其存入控制器或运算器的寄存器中。
The target of the jump instruction itself may be hidden by computing its address in a register and using an indirect jump instruction to transfer control to the address in that register.
可能通过在某个寄存器中计算目标地址、并且使用间接跳转指令把控制传给该寄存器中的地址，把跳转指令本身的目标隐藏起来。
Control unit (controller) : control unit is composed of program arithmometer, instruction register and operation controller, ect.
控制器：控制器是由程序计数器、指令存放器跟操作控制器等组成。
Control unit (controller) : control unit is composed of program arithmometer, instruction register and operation controller, ect.
控制器：控制器是由程序计数器、指令存放器跟操作控制器等组成。
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