一种通过求一个数的补码来得到该数的负数的方法。
A way of producing the negative of a number by obtaining its complement.
无论是正数还是负数，原码的补码的补码还是原码本身。
Whether positive or negative, the source code for the filling yards or the original code code itself.
最后，分组标记符比特通过使用1的补码的同步标记替代。
Finally, the packet marker bit is replaced by the use of a one's complemented synchronization flag.
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