内存对齐的目的 - Purpose of memory alignment

问题：

Admittedly I don't get it.诚然，我不明白。 Say you have a memory with a memory word of length of 1 byte.假设您有一个内存字长为 1 字节的内存。 Why can't you access a 4 byte long variable in a single memory access on an unaligned address(ie not divisible by 4), as it's the case with aligned addresses?为什么不能在未对齐地址（即不能被 4 整除）的单个内存访问中访问 4 字节长的变量，因为对齐地址就是这种情况？

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解决方案：

参考一： https://stackoom.com/question/1bB6
参考二： Purpose of memory alignment