bench-mark

n (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.

belly-dancer, belly-flop, belly-laugh, bellyache, bellyful, belong, belong in, belong to, belonging, belongings, beloved, below, belt, belt line, belting, bemoan, bemused, ben, bench, bench seat, bend, bend one's knee to, bender, bends, bendy, beneath, Benedictine, benediction, benefaction, benefactor, benefactress, benefice, beneficed, beneficence, beneficent, beneficial, beneficially, beneficiary, benefit, benefit from,