base address 基址：
the part of a two-part memory address that remains1 constant and provides a reference point from which the location of a byte of data can be calculated. a base address is accompanied by an offset2 value that is added to the base to determine the exact locationof the information. the concept is similar to a street address system . for example, 2010 main street plus an offset.base address are known as segment address in IBM pcs and compatibles; data in these computers is identified by its position as a relative offset the start of the segment.
维持恒定的两部分内存地址的一部分并提供一个基准点，从这里可以计算一个字节数据的地方。基址随着着一个加到基上的偏移值来确定信息准确的地方（绝对地址）。这一定义与街道地址系统雷同。比如：大街2010号由基（大街2000街段）加上偏移值（从街段开始的10号）。在IBMPC和兼容机中的数据按其相对于由段开始的相对偏移地方被辨别
