计算机系统的运行不能离开主存储器，也被称为内存、主存、基本主存，及随机存储处理器(RAM)，或简单记忆体。
A computer system could not operate without main memory, also called internal memory, primary memory, primary storage, random access memory (RAM), or simply memory.
主存储器是一个易失性存储设备。系统失败时，会丢失其内容。
Main memory is a volatile storage device. It loses its contents in the case of system failure.
它按主存储器里固定的步骤选择和检索指令，以便在适当的时刻激活系统的其它功能组件来执行相应的操作。
It selects instructions from the main memory in proper sequence and sends them to the instruction-decoding unit, which interprets them so as to activate functions of the system at appropriate moments.
它按主存储器里固定的步骤选择和检索指令，以便在适当的时刻激活系统的其它功能组件来执行相应的操作。
It selects instructions from the main memory in proper sequence and sends them to the instruction-decoding unit, which interprets them so as to activate functions of the system at appropriate moments.
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