"We need to be ready, learn these technologies and build our own spacecraft." This is a huge task, but we cannot live up to that legacy. Zhao Fei said, his eyes full of determination.

Arya nodded in agreement: "Yes, it will be a long and difficult journey, but we must remember the wisdom of the lost civilization and believe that we can overcome all challenges." "

They began learning spacecraft design and interstellar engine technology, looking for resources and partners to realize their dreams of space exploration." The process was fraught with setbacks and difficulties, but their determination and conviction kept them persevering.

One day, while they were studying space navigation technology, a mysterious old man suddenly appeared in front of them. The old man's eyes flashed with wisdom and mystery, and he seemed to know their plans.

"I heard that you are going to continue the space exploration program of the lost civilization. The old man spoke.

Zhao Fei and Arya looked at the old man in surprise, not knowing how he found out.

"I used to be part of the lost civilization and I knew their dreams and technology. Now, I would like to help you realize this dream and pass on the legacy of lost civilizations. The old man said.

Zhao Fei and Arya felt extremely honored, and they knew that this old man would be their strong support and guidance. With the help of the old man, their space exploration plan progressed rapidly, their spacecraft was gradually completed, and the interstellar engine became more and more perfect.

"Our dream is about to come true. Arya said, her eyes full of expectation.

Zhao Fei nodded and expressed his gratitude to the old man: "We will work hard for the glory of the lost civilization, and also for the future of mankind." After

the construction of the spaceship is completed, Zhao Fei, Arya and the mysterious old man are ready to embark on their space adventure. However, on the morning of their departure, a local resident hurried to find them.

"Are you going to space? To the south of the mountain, there is a mysterious strange lake, which is also said to have the secrets of the lost civilization. Residents told them excitedly.

Zhao Fei and Arya exchanged glances, they had already heard the legend of the strange lake. Some say there are mysterious creatures there, others say there are treasures buried at the bottom of the lake, but no one dares to venture forward.

"This is our opportunity and we can't pass it up. Zhao Fei said to the old man.

The old man nodded in agreement, so they decided to go on an expedition to Strange Lake before heading to space.

They quickly got kitted up and set out on their journey to Strange Lake. The winding trails in the mountains were challenging, but under the guidance of the old man, they reached the Strange Lake smoothly.

The waters of the lake are turquoise and mysterious, and the shores of the lake are littered with ancient marks and symbols. Zhao Fei and Arya began to take a closer look at the lake and its bottom.

"There must be some kind of secret here. Arya whispered.

Suddenly, there was a strange sound at the bottom of the lake, as if something was moving. They decided to dive to the bottom of the lake to see what was hidden there.

Wearing diving gear, they dived to the bottom of the lake. While deep underwater, they discover an ancient underwater city that seems to be associated with a lost civilization. There are complex buildings and artifacts within the city, and there is even a huge statue with ancient symbols carved into it.

"This is a lost underwater city! Zhao Fei said excitedly.

They begin to explore the city, looking for any clues about the lost civilization. Their attention was caught by a stone tablet in the city, inscribed with information about the history and cosmology of the lost civilization.

"This is an important discovery that may be able to solve more mysteries of lost civilizations." Arya said.

However, just as they were about to return to the lake, a huge current suddenly rolled up, trapping them inside the city. A certain mechanism in the city seems to be triggered, making it impossible for them to leave easily.

"We have to find a way out or we're going to be stuck here." Zhao Fei said nervously.

In the labyrinth of the underwater city, Zhao Fei, Arya and the old man are constantly searching for possible ways out. The structure of the city is complex, full of ancient installations and markers, which seem to hide the wisdom of a lost civilization.

"Here seems to be a test, an intellectual challenge left by a lost civilization. We must proceed carefully and find the right path. Zhao Fei said, his mind full of thoughts.

The old man's eyes flickered on the walls of the city, and he seemed to be looking for clues. Finally, he pointed to an ancient device and said, "Look, there's a door with some symbols carved into it. Maybe that's our way out. Zhao

Fei and Arya immediately walked to the door and carefully studied the symbols. The symbol seems to represent a kind of code that they must unlock to open the door.

"It's a challenge, and we need to unlock that code. Perhaps it has something to do with our previous research on lost civilizations. Arya suggested.

They began to contrast the marks and symbols in the city with the symbols on that door. After some hard work, Zhao Fei finally discovered the pattern and began to unlock the code.

"That's it! Zhao Fei said excitedly.

Together, they arranged the symbols in the correct order, and the door slowly opened. A bright light shone from behind the door, and they prepared for the next unknown challenge.

After crossing the door, they came to another room with an ancient stone tablet carved with ancient words and patterns. Arya began to study the stele carefully, trying to understand its meaning.

"This is an important message that seems to describe the final moments of lost civilizations and their legacy. Arya said.

The old man nodded in agreement: "This information may be one of the last wisdoms left by the lost civilization to future generations. We're going to study it carefully and find clues in it.

Zhao Fei also invested in research, trying to unravel the information in the stone tablet. They know that this information may reveal the last secrets of a lost civilization for them, while also finding their way to the lake.

Zhao Fei, a sunny college student, stepped into his ideal campus life in his freshman year. He has jet black hair, bright eyes, and is always full of energy and a smile. Zhao Fei is a boy who loves to laugh and always makes the class laugh in class, and his optimism and humor attract the attention of many classmates.

At the freshman opening ceremony, Zhao Fei met her for the first time - Lin Yu, a quiet and beautiful girl. Her long hair fell like a waterfall over her shoulders, and her eyes were deep and clear. Zhao Fei was attracted by her beauty and calmness, but did not dare to approach easily.

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