Turn back time 时光倒转; 时光倒流; 回到过去; [例句]I know it is kind of late, but I can't turn back time.我知道有点迟了。但我无法时光到转。逆流 [词典] anarrhea; backset; backwash; contra-flow; adverse current; [例句]由于存在着危险的下层逆流,在大部分海岸线附近游泳都不安全。Dangerous undertows make swimming unsafe along most of the coastline.