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.
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