有關時光倒流的問題

應該可以ga..
but we dont have time machine

In answering your question, it is assume that time machine exists and time travel is possible.

The answer is still no.

What happens now is actually the result of domino effect/cause and effect from the past. Simply saying, what happened in the past impact the future.

Since this is the case, alternating the past will change the future entirely. In short, the future that is known will be completely re-written.

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