If the noise is relatively weak, it may sometimes flip one of the bits in a triplet, changing, for instance, 000 to 010, but it will flip two bits in a triplet far less often.

• 如果杂讯不强，三个位元之中有一个可能会被翻转过来，例如从000变成010，但是翻转两个位元的机会就小很多。