1. 回顾:retromorphosis 退行性变态 | retrospect 回顾 | retrospection 反省
2. 回想,回顾:retrograde 退化 | retrospect 回想,回顧 | retrogress 倒退
3. 追忆:retrospect to 追溯到 | retrospect 追忆 | retrospection 追忆
4. 回想:retrosequence 制动顺序 | retrospect 回想 | retrospective planning 挽救性规划