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.

保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位置。

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The final address is calculated using this formula

使用这个公式计算最终的地址

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Any memory access that is not available by other modes (the address can be calculated by other means and stored in the register, which is then used for the access).

使用其他模式无法进行的内存访问(地址可以通过其他方式进行计算，并存储到寄存器中，然后就使用这个值来访问内存)。

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