bench-markn(a) mark cut in a rock, concrete post, etc by surveyors for use in measuring comparative levels, etc 基准点（测量人员在岩石、混凝土立柱等上面刻下的标记, 用以测量相对高度等.(b) (fig 比喻) standard example or point of reference for making comparisons （供比较之用的）样板或参照点.
牛津英汉双解词典