当编译器不会改变程序的语义时，作为一种优化它可以随意地重新排序某些指令。
The compiler is free to reorder certain instructions as an optimization when it would not change the semantics of the program.
如果你不改变这种程序指令，你的生活永远也不会有什么起色。
It's up to you to change that programming. If you don't change the programming, your life will never change.
程序可以被编码为位模式并存储在主存储器中。然后，CPU可以从中提取指令并执行它们。反过来，要执行的程序可以容易地改变。
A program can be encoded as bit patterns and stored in main memory. From there, the CPU can then extract the instructions and execute them. In turn, the program to be executed can be altered easily.
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