a rule or principle that provides guidance to appropriate behavior
同义词：guideline, rule of thumb
a post bearing a sign that gives directions or shows the way
同义词：signpost
guidepost详细解释
guide.post n.（名词）A post with a sign giving directions for travelers, usually placed at a crossroad.路标：通常放置在十字路口，安有为行人指明方向的路牌的柱子Something that serves as a guide or an example; a guideline.准则：作为指导或榜样的东西；指导路线
