What do you mean, time has passed, and you will never look back, but only remember the past?

When time goes by and never comes back, that is to say, when time goes by, there will be no time to come back, only forward, not backward.

The past can only be recalled, that is, on the basis of the past, it can only be a kind of memory. Recalling the past cannot be changed.

So this is mainly to express a situation that people in the past can only recall and want to experience or change again, but they have never been able to do so. Usually used to express one's regret. Most of them are memories of time and I really want to go back to that time.