guard digit

• 保护位； 保护数位(用来避免溢出时信息丢失)

guard digit的用法和样例：

例句

1. There was a guard around the president.
   在总统周围有数位警卫官。
2. A digit that is generated when a difference in a digit place is arithmetically negative and that is transferred for processing elsewhere.
   当某数位处的算术差为负数时产生的一个数字，它被传送到其它地方处理。