The effective address is, under the hood, always split into a pair of 32-bit registers; the high-order register is optional and if it's not specified, it is treated as zero.
在这种情况下，有效地址总是分为两个32位的寄存器；高位寄存器是可选的，如果没有指定，就会被当作零进行处理。
Similarly, whenever the processor develops an instruction address, the low-order two bits are zero.
同样，只要处理器利用指令地址，低阶的两位就为零。
Similarly, whenever the processor develops an instruction address, the low-order two bits are zero.
同样，只要处理器利用指令地址，低阶的两位就为零。
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