奇偶校验：加于一组二进制数字内的一个校验数元。它跟据系统逻辑，使总数为奇数或偶数。
Parity bit: a check bit added to a series of binary digits to make the total odd or even according to the logic of the system.
通常专门设置一个奇偶校验位，用它使这组代码中“1”的个数为奇数或偶数。
Usually set up a dedicated parity bit, it makes this group code "1" is odd or even.
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