基准的在测量勘定时认为或作为基准的 Regarded or employed as a standard of reference, as in surveying.
与数据媒体基准边并行的轨道或一组轨道中的一条，当数据媒体移动而经过单个读（或写）元件时，就与这种读（或写）元件相联系。 The path or one of the set of paths, parallel to the reference edge on a data medium, associated with a single reading or writing component as the data medium moves past the component.
