An unspecified gadget or other small article, especially one whose name is unknown or forgotten.
未指明的人一种未指明的诡计或其它的小家伙，尤其指不知道或忘记其名字的人
Not specified or not known to an operating system. For example, an "undefined record" is a record of unspecified or unknown length.
指对某一操作系统而言是未确定的或不知道的。例如，某条“未定义记录”就是一种未确定或不知道长度的记录。
Not now, some other time (ie at an unspecified time in the future), perhaps.
现在不行，改天再说吧。
