它包括两个部分：一个内存地址以及一个索引寄存器。
索引寄存器会与某个指定的地址相加，结果用作访问内存时使用的地址。
The index register is added to the specified address, and the result is used as the address for the memory access.
这里有三项数据：一个是基地址，第二个是索引寄存器，第三个是乘数。
Here, there are three entities: one is the base address, the second is the index register, and the third is the multiplier.
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