I feel that this is one of the best movies I've ever seen about time travel, going back to the past, and changing the future. Although it's a small cost, it doesn't have time and space special effects, and it doesn't tell a lot about time and space theory that no one can understand... In my opinion, people can't travel to the future, because we don't need to travel, we always go to the future. For example, if we fall asleep at night, when we wake up, we will travel to the future that belongs to the time before going to bed-tomorrow; and the past, logic People in the past should only be able to go back to the past to observe, but not be able to participate in interaction - just like when we read history books, I think "can't go back to the past" is unreasonable, just as unreasonable as "can change the past". There is scientific value in going back to the past to observe, but if the past can be changed, does the present and the future still have meaning?
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