内部存储器及分类（双语解释）
Internal Memory: According to its position in a computer, memory can be divided into internal memory and external memory. In the mainframe, memory that directly transit information with CPU is referred to as internal memory or primary storage. Internal memory has two functions: one is to provide the access area of rapid data. The other is to act as a bridge between the slow external storage devices and the rapid processors.
In a personal computer, the internal memory refers to dynamic random access memory(DRAM). Its major functions are the followings:
1. To hold temporarily executing programs, primitive data, middle results and arithmetic results.
2. To act as the area of CPU operational procedure.
3. To cooperate CPU in order to communicate with the output devices.
内部存储器：根据存储器在计算机中所处的不同位置，可分为内存和外存。在主机内部直接与CPU交换信息的存储器成为内存或主存。内存有两个功能：一个是提供快速数据区域，另一个是在慢速的外部存储器设备和高速处理器中担任中间角色。
在PC机中，内存指DRAM动态随机存储器，主要作用是：
1. 暂时存放正在执行的程序、原始数据、中间结果和运算结果。
2. 作为CPU运行程序的区域。
3. 配合CPU 与外部设备打交道。
RAM is the abbreviation of the random access memory, which is one of internal memory. Its main characteristic is to read or write data at any moment. But once the power is cut off, all the data stored will disappear at once. Major function of RAM is to store program and data temporarily. RAM can be divided into two types: DRAM(dynamic random access memory) and SRAM(static random access memory). DRAM’s storage density is higher and its cost is low, but its speed is slow. SRAM’s speed is high, but storage density is low and its cost is high. The memory on the mainboard is just dynamic random access memory. And static random access memory is the buffer memory between CPU and internal memory.
RAM是随机存储器的缩写，它是一种内存，主要特征是可随机读出或写入数据，但电源中断则所存储的数据立即消失。它的主要功能是用来暂存程序和数据。RAM又可分为动态随机存储器DRAM和静态随机存储器SRAM两种。DRAM的储存密度较高，成本低，但速度慢。SRAM速度快，但存取密度低，成本高。主板的内存即是动态随机存储器，CPU与内存之间的缓存即是静态随机存储器。
ROM is the abbreviation of read only memory, which is one of internal memories. ROM’s characteristic is to read only data, but cannot write data. That is to say, its storage contents will not be rewritten, and will not also disappear though the power is broken off. Generally ROM is used to store system program such as BIOS.
ROM是只读存储器的缩写，它是内部存储器的一种。ROM 的特点是只能读不能写，即它存储的内容不会被改变，并且断电后也不会消失。通常，ROM用来存储系统程序，例如BIOS.
Key words & Expressions:
abbreviation: n.缩写，缩写词
dynamic: adj.动态的
density: n.密度
mainboard: n.主板
buffer memory: 缓冲存储器
system program: 系统程序
In a personal computer, the internal memory refers to dynamic random access memory(DRAM). Its major functions are the followings:
1. To hold temporarily executing programs, primitive data, middle results and arithmetic results.
2. To act as the area of CPU operational procedure.
3. To cooperate CPU in order to communicate with the output devices.
内部存储器：根据存储器在计算机中所处的不同位置，可分为内存和外存。在主机内部直接与CPU交换信息的存储器成为内存或主存。内存有两个功能：一个是提供快速数据区域，另一个是在慢速的外部存储器设备和高速处理器中担任中间角色。
在PC机中，内存指DRAM动态随机存储器，主要作用是：
1. 暂时存放正在执行的程序、原始数据、中间结果和运算结果。
2. 作为CPU运行程序的区域。
3. 配合CPU 与外部设备打交道。
RAM is the abbreviation of the random access memory, which is one of internal memory. Its main characteristic is to read or write data at any moment. But once the power is cut off, all the data stored will disappear at once. Major function of RAM is to store program and data temporarily. RAM can be divided into two types: DRAM(dynamic random access memory) and SRAM(static random access memory). DRAM’s storage density is higher and its cost is low, but its speed is slow. SRAM’s speed is high, but storage density is low and its cost is high. The memory on the mainboard is just dynamic random access memory. And static random access memory is the buffer memory between CPU and internal memory.
RAM是随机存储器的缩写，它是一种内存，主要特征是可随机读出或写入数据，但电源中断则所存储的数据立即消失。它的主要功能是用来暂存程序和数据。RAM又可分为动态随机存储器DRAM和静态随机存储器SRAM两种。DRAM的储存密度较高，成本低，但速度慢。SRAM速度快，但存取密度低，成本高。主板的内存即是动态随机存储器，CPU与内存之间的缓存即是静态随机存储器。
ROM is the abbreviation of read only memory, which is one of internal memories. ROM’s characteristic is to read only data, but cannot write data. That is to say, its storage contents will not be rewritten, and will not also disappear though the power is broken off. Generally ROM is used to store system program such as BIOS.
ROM是只读存储器的缩写，它是内部存储器的一种。ROM 的特点是只能读不能写，即它存储的内容不会被改变，并且断电后也不会消失。通常，ROM用来存储系统程序，例如BIOS.
Key words & Expressions:
abbreviation: n.缩写，缩写词
dynamic: adj.动态的
density: n.密度
mainboard: n.主板
buffer memory: 缓冲存储器
system program: 系统程序
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