() space-time, which is a collective noun, i.e., time and space.

The connotation of time is endless and eternal, the connotation of space is unbounded and eternal, "endless" and "unbounded", this is the absolute concept of time and space.

...........

"En~En~En~En' shuttles through time and space~."

This lyric literally, shuttling through time and space, this is obviously a contradictory sentence, the sky, the deep sea, the island, these can all be shuttled, but how to travel through time and space?

In other words, if a race had the ability to travel through time and space, it would completely overturn the existing theories of this world, because it involves an unavoidable problem, the paradox of time.

The paradox of time, which is caused by time travel or traveling through time and space, is logically deduced from each other, and the simple point is that the same person in the same space cannot appear on the same timeline, no matter what point in time it comes from.

Because, according to the evolution of the butterfly effect, once the person's past or future behavior is deviated, the chain reaction will be unpredictable, and if it does happen, it will theoretically even be so serious that the world will disappear due to logical collapse.

However, unless there is a circumstance.

That is, the person who travels through time, has not had any impact on this world from beginning to end, his birth, growth, and finally disappearance cannot affect the trajectory of the current world, and to the world, he is a person who does not exist.

Of course, this situation is very difficult to happen, it is impossible to have no impact on the world, as long as you eat, as long as you breathe, it will be difficult to cause a small amount of impact, but the magnitude of this impact will become a condition for traveling through time and space?

Since you can't do it without impact, reduce it to a minimum. So, how do you minimize impact?

If a person or race is something that does not exist in the eyes of the creatures of the world, something that has not been heard of, and even if someone has heard of it, it has not really seen it, then it has the least impact.

Combined with the above analysis, there is only one ethnic group, the deep sea family.

..............

Looking at Scati's somewhat dazed expression, Xia Feng felt that she didn't know about time and space travel, which means that it was very likely that this phenomenon happened without her knowledge.

Taking another 10,000 steps back, Xia Feng couldn't be sure if the past she had just mentioned was time travel.

If analyzed from an absolutely objective point of view, this is no longer a question of science or magic, but a philosophical one.

For example, a primary school student picked up an injured small animal, he brought the small animal to the class, and the head teacher asked the class leader to use the class fee to buy food for the small animal in order to cultivate the love of the students, so the question is, what is this animal, from the first time I saw it, the class students thought that the animal was a cat, and of course, the class leader went to buy cat food.

But in fact, the animal is not a cat, but a turtle, surprise or not? It's a turtle, you can think that the students in this class were kicked in the head by a donkey, but they just think that this little turtle is a cat, then, in a sense in this time and space, this turtle is a cat, because its existence has led to the sale of a bag of cat food, and through the spread of the students, the information of picking up a cat may have other effects.

This is an alternative manifestation of idealism, a person who travels back from the future through a time machine is standing on the road, but all the passers-by think that he is a god-disease, then, he is a god-disease, unless his behavior can cause a qualitative change, otherwise the impact he can cause is only the effect of a god-disease.

In other words, if Xia Feng thinks that the past mentioned by Scati is related to time travel, or thinks that it is just a dream of hers, the result will be biased, but this deviation is in the future, and he has no way of knowing now.

............

Think about it.

If Scati had experienced a time travel that even she didn't know about, it wouldn't have .........

Kindness?

Thinking of this, Xia Feng suddenly realized a problem, it was like suddenly discovering a hidden third road at a fork in the road from left to right, which made his whole person flash with a flash of inspiration.

.............

On the deck, Xia Feng frowned and began to think seriously.

In his cognition, all changes are relative, that is, they need to be referenced.

For example, in a 100-meter race, if you just run 20 meters and fall, then you are behind, if everyone falls at this time, then you are not behind, but you are not the same, but if at this time other people not only fall, but also backwards in a strange way, then in a sense, although you are lying on the ground and not moving, you are indeed moving forward.

If the time and space of the world are changed, whether backwards or forwards, everything changes in the order of evolution, but you do not change.

Is this a kind of time travel?

At any time, the boundless ocean is the same, and even the creatures that live in the sea are difficult to notice changes, and to put it bluntly, if the time of this world is now turned back by three years, the scenery he sees on the ship will not change.

The difference is that he may meet someone who existed on this plane three years ago.

It's like the old days that Scati brought up.

..............

Seeing that Scati looked a little confused, Xia Feng made a bold guess in his heart.

The so-called shuttle of the Deep Sea Clan in time and space is not really a shuttle, but is not affected by the changes in time and space, this range may be a clan, or a specific person in the clan, such as a bloodline or the like.

Of course, even if the truth was really as he guessed, he still didn't feel clear, because there was another question he couldn't think of an answer to, who was the person Scati saw back then?

To be honest, Xia Feng already had a terrifying guess in his heart, but even he didn't dare to believe this result, or he didn't want to believe it.

..............

The sunset on the horizon is getting redder, and it seems that tomorrow will be a good day.

Scati at the edge of the deck flicked her hair.

"Why did you suddenly stop talking?"

Xia Feng immediately came back to his senses from his thoughts.

"Oh, nothing, just remembering something, you can go on."

"I don't have much to say, if you don't have any other questions, we may have to say goodbye, although I am very interested in the braised fish you just mentioned, but I'm afraid I don't have a chance, I still have important things to do."

With that, Scati stood up and raised the strange greatsword next to him with one hand.

Seeing that she was about to speak, Xia Feng immediately spoke.

"Wait a minute, I have one last question."