base address 基址：
the part of a two-part memory address that remains 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 offset value that is added to the base to determine the exact location(the absolute address)of the information. the concept is similar to a street address system . for example, "2010 main street " plus an offset(10from the beginning of the block ).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.
保持恒定的兩部分內存地址的一部分并提供一個基準點，從這里可以計算一個字節數據的位置。基址伴隨著一個加到基上的偏移值來確定信息準確的位置(絕對地址)。這一概念與街道地址系統雷同。例如：“大街2010號”由基(大街2000街段)加上偏移值(從街段開始的10號)。在IBMPC和兼容機中的數據按其相對于由段開始的相對偏移位置被識別。
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