time travel generally talks about two kinds, one is that there is only one universe, and you will return to your past when you wear it back, but these can't change anything. Now you wear it back and you are affected by the self who wears it back. It is an endless loop. The other is the traversal between parallel universes. There are many parallel but slightly different universes. You can’t go back to your own past, you can only traverse the past of another parallel universe. Every time you cross, there is a little bit every time. Different, the final quantity changes to the qualitative change will have a big change.
The heroine has been saying that time is our only currency, and that a large amount of time travels can eventually be exchanged for the result he wants.
In addition, I think that the left and right of operating the equipment is not just about the experiment being successful or not being alive. Going left to the universe on the left, the equipment is intact; going to the right to the universe on the right, the equipment explodes. This can explain the fact that there were three male protagonists crossing a space in the middle.
Quite a brain-burning, very good science fiction film.
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