缺省，默认某一变量的特定值，由操作系统自动指定并持续有效，除非操作者取消它或使它无效

缺省，默认某一变量的特定值，由操作系统自动指定并持续有效，除非操作者取消它或使它无效的英文翻译

基本释义

• A particular value for a variable that is assigned automatically by an operating system and remains in effect unless canceled or overridden by the operator.