指令和数据在计算机的内存中一时用不到的话，就要用辅助存储单元来对它们进行保存。
Auxiliary storage units are used to store instructions and date when they are not being used in main memory of the computer.
在具有微程序控制的指令集的微型计算机中，它包含另外的控制存储单元。
In a microcomputer with a microprogrammed instruction set, it contains an additional control-memory unit.
大多数指令有一个或多个操作数，赋予具体源值以备执行操作以及目标存储单元显示结果参考。
Most instructions have one or more operands, specifying the source values to references in performing an operation and the destination location into which to place result.
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