hark-backWiktionary 原文英/ˈhɑːkbæk/美/ˈhɑrkˌbæk/词源说明Deverbal from hark back.释义名词noun1(hunting) An act of hounds retracing a course in order to pick up the lost scent of prey.2figurativelyAn act of alluding, returning, or reverting (to a subject previously mentioned, etc.); also, an act of evoking, or longing or pining for (a past era or event).