retraces

1.折回,折返,退回

2.探源,调查追溯

3.回想,回忆;回顾,回头看,重看

4.重新再描摹

1.to return along the same path or route that you have just traveled along; to go along the same path or route that someone else has gone along previously

2.to discover where someone or something has been and what happened to them there by examining evidence, asking questions, etc.