6. Time past cannot be called back again.

　　光陰一去不復返。/時間不能倒流。

　　相關例句：

　　1. All time is no time when it is past.

　　光陰一去不復返.

　　2. No moment will ever repeat. Savor time with family and friends.

　　光陰一去不復返,要享受和家人朋友共聚的時光.

　　3. No hand can make the clock strike for me the hours that are passed.

　　光陰如流水,一去不回頭。