retrace
/rɪˈtreɪs/verb
with obj.
1- go back over (the same route that one has just taken)顺（原路）返回：
he began to retrace his steps to the station car park.
他开始顺原路返回车站停车场。
1.1
- discover and follow (a route or course taken by someone else)重行（另一人走过的路线）：
I've tried to retrace some of her movements.
我试过重新去走她的一些活动路线。
1.2
- trace (something) back to its source or beginning追溯; 溯源：
I wanted to retrace a particular evolutionary pathway.
我想弄清一种特定进化途径的起源。
词源
late 17th cent.: from French retracer.