retrace
/ri:ˈtreɪs; rɪ`tres/ v[Tn]
1 go back over or repeat (a journey, route, etc) exactly 折返或重行（原路程、 路线等）
retrace one's steps, ie return the way one came 顺原路折回.
2 recall a series of (past actions, etc) 回忆, 回顾, 追溯（经过情形等）
Police retraced the movements of the murder victim. 警方追溯了那被谋杀者当时的情形.