adj.向后的；反向的；怯生生的；落后的adv.向后地；相反地；回溯地； 双语释义：adj.(形容词)向后的；朝后的 directed or moving towards the back; directed towards the back, the beginning, or the past倒退的；反向的 moving in a direction that means that no progress is being made落后的；缓慢的 having made less progress t