Zhang Le looked at Zha Hongyun.

"Tell me, is there anything else you haven't figured out?" Zha Hongyun's expression was flat.

Xu Lang slowly put on the windproof goggles and asked, "How can the energy circulation system of the engine be 100% recovered?" ”

Zha Hongyun was silent for a while before he said, "Xu Lang, you are really a genius, it's a pity." If you do succeed, remember to be nice to humans! ”

"Don't worry! In the future, I am unlikely to have crossed paths with humans. Once the starship is built, I will leave Earth, and besides, I intend to spend 10,000 years on interstellar voyages. So, if nothing happens, we'll soon be goodbye! There was no emotional fluctuation in Xu Lang's voice, obviously, he had already made a decision.

"In that case, I believe you. It's always a colleague, you come with me, I will give you the most critical part of the drawing! Zha Hongyun said suddenly, and then, he stood up and walked to another room.

Xu Lang quickly stood up, hesitated, and stopped, before he said to Zhang Le: "Zhao Fei...... How is she doing? ”

"She...... I'm married, I've got children, what's wrong? Do you still want to see her? I know where she is! Zhang Le said.

"Forget it! Good bye! Zhang Le could see Xu Lang's tall body, and instantly slackened a lot.

However, he did not feel guilty at all. Life is precious, but there must be a bottom line to be a man, no matter what the purpose, Xu Lang's killing of his former colleagues has touched the bottom line. Although in essence, he is still not a bad person.

Although Xu Lang has become a monster, Zhang Le still thinks that Zhao Fei and Xu Lang are a good match in his heart, but doesn't too perfect love end in tragedy to be more perfect? Liang Zhu is, and so is Zhu Luo.

"I'm just making your love more perfect!"

Half an hour later, Zha Hongyun came back, alone.

Xu Lang is gone.

**************************************

It took a week for Zhang Lecai to bring the three of Zha Hongyun back to Chengdu. The three of them came from the icy North Pole to the icy Chengdu again, a little confused. Chengdu officials who got the news immediately picked them up.

Zhang Le didn't go to the welcome dinner, he asked for a huge warehouse and had people pull in the hut he had made especially for the trip.

He didn't have Sandy's gifted teleportation skills, and besides, Sandy couldn't have been by his side all the time. So, he couldn't have relied on Sandy for long journeys all the time. The discovery of gravitational line channels opened him up to a new world.

The gravitational line channel has its own special space, which is not suitable for ordinary human existence. If you want to carry a normal person, you have to make a sealed space with oxygen, and this space has to be tough enough. Fortunately, Zhang Le has experience in making sealed balls, and he has transformed the chestnut tree into a sphere space, and put an imitation solar incandescent lamp provided by Zha Hongyun into the space, plus Zhang Le and several human beings, and a closed oxygen-carbon dioxide circulation system has been formed inside this space.

Coupled with the white light energy provided by Zhang Le to provide nutrients for plants, an ecological hut that can carry ordinary people is formed.

It took five days to make the hut and only two days on the journey.

Now, Zhang Le's idea is to make this travel cottage even more perfect. In particular, the waste generated by human life must be used as nutrients for the plants in the hut. At the same time, there must be a self-regulating system inside the space that allows all waste to be transformed into the necessities of human life, not just air, but also food.

From the point of view of energy conservation, this hut is a closed energy operation system. If there is no energy leakage, it is completely self-sufficient internally.

Originally, Zhang Le's purpose was just to make a travel cabin, but now, he has set his sights on interstellar voyages. Although Xu Lang has become a bad guy in a sense, Zhang Le, as a fan brother, still can't help but follow Xu Lang's approach, although he is not sure when he will start this voyage.

With the help of gravitational lines, the most important problem of power in interstellar travel is solved. Now Zhang Le's only consideration is to make interstellar travel into interstellar travel, and comfort is the first consideration.

Zhang Le's ideals are very full, but the reality is very cruel, and he encountered a big problem in the very initial stage of his design. The problem of non-lossless conversion of energy, especially how the imitation sun lamp, as the core accessory, can obtain energy from plants to achieve permanent illumination.

After thinking hard for two days, he finally realized that behind closed doors was not the way to go.

Inside a huge mountain, Zhang Le met Dr. Cha Hongyun again. Today's academician Zha is not the same as he was in the Arctic a few days ago, his mental state has undergone earth-shaking changes, Zhang Le is really worried that he will suddenly be overexcited, after all, he is also over fifty years old.

Listening to Zhang Le's idea, Zha Hongyun's jaw almost dropped. Although it is only an idea, it is a lot higher than Zha Hongyun's starship in terms of concept.

"It's good for young people to have ideas, and they're very creative, so I just want to ask you, is there something wrong with your brain? If that's the case, I'm going to consider whether or not to marry my daughter to you! She's so much smarter than you, and I don't want my eldest grandson to be a fool! Zha Hongyun said very tactfully.

"Academician Cha, do you have an opinion about me?" Zhang Le asked curiously.

"Originally, there was no opinion. But when I heard that my smart daughter was going to marry you as a monster, I felt awkward no matter how I looked at you! ”

"What's wrong with me?" Zhang Le asked.

"Why isn't it weird? Xu Lang is right, are you still human? I only hope that my daughter will marry an ordinary human and live an ordinary life, you fight and kill every day, I don't feel at ease! Zha Hongyun said.

"So what can I do to reassure you?" The future father-in-law can't be offended.

"You...... Continue to study, I can make an exception, take another master's class, finish the master's degree, and then study for a doctorate, and when you graduate, I can rest assured that I will hand over my daughter to you! Zha Hongyun thought for a moment and said.

"You just hate my low education, don't you? And make up such a reason! Zhang Le said angrily.

"Nonsense, except for Xiaoxia, who didn't have time to finish her studies, all the others graduated with a doctorate, are you an undergraduate embarrassed to enter our house?" Zha Hongyun said as a matter of course.

"Okay, I got it!" Zhang Le said noncommittally perfunctorily.

Zha Hongyun pretended to look around unintentionally, suddenly approached Zhang Le, and said in a low voice: "I didn't say anything about Xu Lang's new energy technology, and you will keep it secret for the time being, Chengdu is very complicated now, you should keep an eye on it." After a while, I'll visit Xiaoxia, and then we'll talk about it. Your idea is good, you can use Chengdu's scientific research strength to do some basic preparations first, and put the core things first! I'll give you the manpower and the money! ”