指定的对齐值不能小于最大的节对齐。
The alignment value that you specify cannot be smaller than the largest section alignment.
数字4表示使用四字节对齐(总是使用四字节)。
The number 4 indicates to use four-byte alignment (always use four bytes).
这意味着字将是4字节对齐的,半字将是2字节对齐的,而字节则不需要对齐。
That means that words will be 4-byte aligned, halfwords will be 2-byte aligned, and bytes don't have to be aligned at all.
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