The moment Liu Zhen entered the portal, he suddenly felt a strong suction, followed by a dark in front of him, and in an instant, he felt the softness of fine sand under his feet, and when he opened his eyes, he was already in a new environment, and he was indeed standing on the soft sand.

It is a sandy area the size of two football fields, surrounded by the endless blue water around it, with the occasional white clouds drifting over the blue sky and the warm sunlight shining down.

On the left side of the sandy land was a small hill, which took up almost a third of the island, and was covered with vegetation, growing wild and disorderly, which was evident from the fact that it had not been tended for a long time; On the far right side of the island are five small cabins, each about 10 meters apart, which look a little dilapidated due to long-term erosion by the sea breeze and rain.

Suddenly suspended in the sky was a huge display board, which read: "Time: 0 days, 12 hours, 22 minutes, 23 seconds; Force field gravitational coefficient: 1.2 times. ”

In the distance, Tang Doudou waved to Liu Zhen, she was watching Ma Ma and Dorjee play table tennis, Liu Zhen was right, Ma Ma and Dorjee were playing table tennis!

Liu Zhen ran to Tang Doudou's side with heavy steps, and the table tennis table was also a little potholed under the erosion of the natural environment, and the table tennis ball would often pop up some directional balls when it fell on it.

"1.2 times the Earth's gravitational coefficient, it feels okay?" Tang Doudou said with a smile.

Tang Doudou's smile always made Liu Zhen feel like a spring breeze to enjoy his face.

"It's okay, I just feel like I have dozens of pounds of fat on my body," Liu Zhen said with a smile.

At this time, I listened to Ma Li shouting while playing: "I think about training table tennis, our national table tennis is the first school in the world, even if I lose if I don't win the championship when I go out to compete, I don't want to join in the fun." ”

Dorjee didn't speak, and a ball slammed over......

"Come on, Brother Mali, table tennis is the best reaction training, and it also takes into account speed and body coordination, I'm optimistic about you", Tang Doudou chuckled after speaking.

"Can you tell me where this is?" Liu Zhen asked Tang Doudou in a low voice.

Tang Doudou said, "I'll show you around," and the two walked side by side along the beach towards the small hill.

"Just like the infinite non-cyclic decimal in mathematics, space will have a similar phenomenon when it develops along the time axis", the two walked slowly along the beach barefoot along the beach, Liu Zhen did not speak, and listened to Tang Doudou's eloquent talk.

"Numbers can be rounded up to take the few digits you need, but space can't, so there will be some small particles of space that will float around the backbone of space-time."

As he spoke, Tang Doudou walked in front of Liu Zhen, untied the leather band on his horsetail and put it on his wrist, then turned around, and continued as he retreated: "These free space particles no longer belong to any period of history, but as a space itself, they are real", and combed his long hair with his hand.

The wind blew Tang Doudou's hair, the tips of the hair fluttered with the wind from time to time, dancing on Tang Doudou's cheeks and the corners of his mouth, and the corners of his smiling mouth were slightly upturned, showing a lovely pear vortex, Liu Zhen didn't feel a little distracted.

Tang Doudou turned around and walked side by side with Liu Zhen again, just lowering his head, his face was slightly red, and he didn't speak anymore.

Liu Zhen hurriedly explained: "I was just thinking about what you said, and I didn't mean to keep staring at you. ”

"I know, I know", Tang Doudou also hurriedly responded, "I'll tell you next." ”

"Okay, go on, go on", Liu Zhen tried to take his mind back and listened intently.

"Me, where did I just say?" Tang Doudou asked embarrassedly with a red face.

"It seems to say that these free spaces do not belong to any history, but they exist as spaces," Liu Zhen replied.

"Well, human beings also inadvertently discovered these free spaces when they were studying wormholes, and the place we are in now is a free space, although it does not belong to any historical stage, but it is still limited by time," Tang Doudou continued.

"We, the Human Space-Time Bureau, not only do research and management of wormholes, but also discover, develop and manage free space is also the main work," Tang Doudou said with a serious face.

"Is there a lot of free space?" Liu Zhen asked.

Tang Doudou said with a smile: "Well, there are more than 10 million found so far, but most of them are free from the early stage of the formation of the earth, and human beings cannot be modified at all, and most of them are gaseous." ”

"There are only more than 3,700 spaces suitable for human access, the largest is more than 100 square kilometers, the smallest is only a few square meters, and our beach is called 'Doudou', which covers an area of nearly four square kilometers," Doudou said with a proud smile.

"Then this is your territory", Liu Zhen was slightly surprised.

"It can also be said that this is a space discovered by human beings relatively early, when it was used to study the gravitational force field and climate modification, and then found a more suitable research space, this was abandoned, I often came to play with my family when I was a child, and when I was in school, my classmates and I often came here to engage in construction and partying, and then there were more and more free spaces, and no one asked about this small place, I remodeled it with my father, and then declared the name in the Time and Space Bureau. Doudou's beach', the Time and Space Bureau handed it over to me to manage, and my DNA information is needed to log in", Tang Doudou looked proud.

"Then how do I feel, it's so big here, you can see ......", Liu Zhen pointed to the endless sea with a puzzled expression.

Tang Doudou chuckled again: "The sea and the celestial phenomena are real projections, this was originally just a desert space, but it has been transformed to become what it is now, everything on the island was transformed later, and I did a lot of it." ”

Liu Zhen couldn't help but think of a movie - "Truman's World".

"The largest free space now is the real base for the evolution of animals and plants, and there are still many spaces that have been developed," Tang said.

"Isn't that the ark full of portals?" Liu Zhen asked puzzled.

Tang Doudou explained: "Pseudo-wormholes are different from wormholes, pseudo-wormholes can only go back and forth to the free space, and there is no requirement for the timeline, so the technology content is relatively low, safe and stable, and there are not too many portals in the free space on the ark, many public places have them, and most of the available space is open to the public, and you can enter and exit without a password and click on the menu; The wormhole-like system has strict timeline requirements, and there are only two timeline portals on the Ark, one is in use in the Human Space-Time Bureau, and the other is in the Human Science and Technology Bureau to continue to develop and transform. ”

As they walked and talked, they came to the side of a small hill with strong vegetation, and at this time, several thin metal pipes stretched out around the hill, spraying bursts of water mist into the sky, which looked like the regular watering system of a golf course, and the sun shone on the water mist in the air, reflecting a brilliant rainbow.

Disturbed by the spray of water, a few hares ran out of the grass, and a few pheasants and ducks flew out of the fluttering edges.

"It's a paradise", Liu Zhen couldn't help but sigh.

"This is underground fresh water," Tang Doudou said proudly, "This is a complete set of spatial water circulation system, which I designed and manufactured." ”

"In this ecological environment, no wonder there are wild animals", Liu Zhen sincerely admired.

Tang Doudou smiled and covered his mouth: "The rabbits and chickens and ducklings I used to raise, these should be their descendants." ”

Looking at the appearance of these poultry and livestock who don't pay attention to their appearance and image jumping up and down, Liu Zhen laughed and said: "It's too informal, it's just like wild." ”

The two walked along the beach to the other side of the island, chatting and walking, and the portal stood on the sand like a large oval mirror, glowing blue with bursts of light.

They walked towards the cabin on the other side of the island, at this time Ma Li and Dorjee had stopped their table tennis training, and when they passed by, Ma Li was lying on the beach and doing push-ups hard, and Dorjee was standing by with his arms in his arms and watching.

"What kind of training do you call it, just walk around the island?" Ma Li tilted his head while doing push-ups and said to Liu Zhen and Tang Doudou who were passing by.

"That's right, that's my training method, do you want to be together", Tang Doudou quipped.

Ma Li glanced up at Dorjee, gasped and said, "Big Brother Dorjee is the number one fighting brand in my heart, I must show my loyalty to the brand", and continued to work hard to do push-ups.