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The difficulties encountered in the Mars expedition were as follows: ** 1. Technology ** 1. ** Propulsion system is related to navigation ** - Mars was far away from Earth. To send the probe to Mars, a powerful and precise propulsion system was needed. The probe had to operate stably during the long voyage and reach Mars accurately. During this period, it had to overcome the gravity of Earth and Mars. For example, on the way to Mars, the probe had to fly for a long time in a gravity-free environment, which required the stability and power of the propulsion system to be extremely high. 2. ** Detector Design and Protection ** - In the deep space environment of Mars, the probe must be able to withstand high-energy radiation, small meteorites, and extreme temperature changes. The thin atmosphere of Mars could not effectively block cosmic radiation. The electronic equipment and instruments of the probe were easily damaged by radiation, affecting its normal operation. - The terrain on Mars 'surface was complex, covered with dust and rocks. The structure of the probe's outer shell needed to be strong enough to prevent damage from impact. At the same time, the probe's materials had to be able to adapt to the low temperature environment of Mars to ensure that there would be no failure of components on the cold surface of Mars. - The landing of the Mars probe was a big technical challenge. When entering the Martian atmosphere, the detection and remote control signals would be weak, and there would be communication delays. The probe had to complete the entire landing process on its own. During the landing process, there were "seven minutes of terror." The probe needed good thermal protection measures, as well as parachutes, airbags, and buffer rockets. The entire process had to be precise to reach the surface of Mars. 3. ** Energy supply ** - Solar probes, such as the Opportunity, faced many challenges on Mars. Sandstorms were extremely frequent on Mars. Once the solar panels were covered in dust, it could cause the probe to lose its energy supply and end the exploration mission. ** 2. Science ** 1. ** Mars environmental research ** - Although humans had some understanding of Mars, there were still many unknowns. The terrain of Mars was complex and diverse. Its real climate and mineral composition needed further in-depth study. These unknown factors would bring many uncertainties to the exploration. 2. ** Cosmic radiation effect ** - Mars did not have the same magnetic field protection as Earth. Astronauts or probes on Mars had to face high-energy radiation from the universe. For astronauts, this could have a serious impact on their health, such as damage to cells and organs. For detectors, radiation could interfere with the normal operation of electronic components. ** 3. Economics and politics ** 1. ** Capital investment ** - Mars exploration required a huge amount of capital investment. From the development, manufacturing, launch, to the subsequent operation and maintenance of the probe, every step was costly. Moreover, the payback period was long and required long-term financial support. 2. ** International Cooperation ** - The Mars exploration mission was complicated, and it was difficult for a country to complete it alone. From the sharing of propulsion system technology to the selection of astronauts (if it involved manned Mars exploration), all aspects required close cooperation between countries. However, in the process of international cooperation, there would be problems such as the coordination of political and economic interests between different countries. ** 4. Physiology (for manned Mars exploration)** 1. ** Long-term weightless environment ** - During the months-long flight to Mars, astronauts needed to adapt to the weightless environment for a long time. This prolonged weightlessness would have a negative impact on the astronauts 'bones, muscles, and cardiovascular system, such as bone loss, muscle wasting, and decreased cardiovascular function. 2. ** Radiation Protection ** - During space flight and activities on the surface of Mars, cosmic radiation could cause irreversible damage to astronauts due to the lack of protection from the Earth's magnetic field. How to provide effective radiation protection for astronauts was a difficult problem that must be solved in manned Mars exploration. The novel "Mars of Paradise" is equally exciting. Everyone is welcome to read it!

In the ending of the TV series," Who is the Hero?", Wenrou and Wang Xiaoshi wandered the world together. However, according to the description in the original work, in the end, Wenrou and Wang Xiaoshi had another conflict and disappeared. In the end, Wang Xiaoshi could not find Wenrou, and he lived a lonely life. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

He recommended a few novels. "Douluo: Starting from Spirit Hall to build God Country", author Jian Jia Crossing the River, is Douluo's masterpiece. The male protagonist Tian Hao wanted to rise all the way in Spirit Hall, walking towards the peak. More than 10,000 words have been written every day. The characters were interesting, the author had a big imagination, the protagonist was scheming, and he created an enhanced version of the soul master system. The plot of the mastermind flow was superb. "Heavenly Demon in Two Realms", a sci-fi time-travel novel written by Zhang Taixuan. The protagonist Zhang Qingyang changed the fate of the world after obtaining the system. The logic was clear and the writing was mature. Although it was called the Heavenly Demon of the Two Realms, the feeling of being a demon was not obvious, but it was not bad. Today is the Doomsday, a doomsday novel by Little Treasure 2. The main character, Zhang Zimin, had a persecutory delusion. He spent all his wealth to prepare for the apocalypse. The early stages were very exciting, and the main character had a good outlook on life. However, there were some problems at the end, such as the theme being crooked and the setting of mourning, but it was still considered a novel doomsday novel. The Rise of the Dark Wave was a fantasy novel written in a foreign land. A new author, but the battle scene description was superb, the story was novel, there was no main character template, and the power system was amazing. Although there were flaws, it was worth a look. Lifestyle Druid, a creation that traveled thousands of miles. It was a story about a Lifestyle Druid. It was an old theme with a new feeling. It was very immersive. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

I recommend " Zhu Tian: I'm Too Popular After Divorce " by Five Gourds Four Seas. In his previous life, Su Chun was deceived by Zhai Jingjing. After his rebirth, he immediately divorced her. He wanted to focus on his career and stay unmarried, but in the end, he was too popular. The female characters in the book were Li Na, Zhu Suosuo, Gu Jie, and Jiang Nansun. The female protagonist was Zhang Ruonan, each with their own characteristics. However, the reading list was a little disappointing. " Crime Merchant " must be recommended. It was a supernatural novel about urban supernatural techniques written by Three Days and Two Sleeps. The story revolved around the genius. He raised the flag of the reverse cross, and the characters embarked on the road to overthrow the decadent country with different purposes. The character creation and narration were great, but the beginning was difficult. It was a little brain-burning, with flashbacks, chaotic timeline, and other problems. However, it was great to persevere. The readers gave two opinions. I think it's a divine work, and the recommendation index is very high. " Super Trash King ", an urban supernatural novel written by Crazy Mouse. It was a story about trash turning into treasure and the system sweeping trash in the phone. Although the old cheat was strong, the villain's intelligence was on the line. He was not stupid or delusional. It was a cool novel. The writing style was average, but it was good to read faster. " City Hunter " was awesome. It was an urban adventure mystery. The main character was a hunter who hunted strange creatures. The description of the environment and the animals were great. The plot was as compact as Grave Robber's Chronicles. It wasn't stupid. The protagonist's teammates and villains were all smart. The female lead wasn't a vase. It was worth watching. " The King of the City " was a novel about urban life written by Casanova Onitsuka. The old plot was written with new insights. It was about the transformation from poor, short, and ugly to tall, rich, and handsome. If you were interested, you could read it. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There was information that showed that the Douluo Continent card in the trading card game could be bought in the supermarket. There were also merchants selling the luxury version of the Douluo Continent card, the rare two-bomb SSR card, the QR card, the puzzle card, the platinum collector card, and so on. It was suitable for people of different ages, so it was possible to buy the Douluo Continent card in the supermarket. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Hehe, Xu Qi 'an was very smart. When he was being dragged by his colleagues to treat him to a meal in the county office, he suddenly stepped on a piece of silver. He quietly stepped on it and pretended to look at the scenery. When his colleagues took a few steps forward, he quickly lowered his head and picked it up. Then, he put it into his wallet without changing his expression.

He could consider the men's shoes in stock. The new style of online celebrity Heide's training shoes for men's autumn and winter cotton shoes. This was a microfiber leather shoe. The price was between 95 - 110 yuan. It was suitable for young people aged 18 - 40 years old. It was suitable for autumn wear and had the function of keeping warm. There were also new men's low-cut comfortable thick-soled shoes sold directly by the factory. The price was 63 yuan (1 - 14 pairs), 61 yuan (15 - 64 pairs), and 59 yuan (65 pairs and above). The upper was made of artificial Pu, the sole was made of rubber, and the upper was low-cut and had shock absorption function. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The main responsibility of the seventh-grade Feng Shui Master, a warlock, was to survey the terrain, observe Feng Shui, and make outstanding contributions to the selection of graves and the layout of homes for the common people and nobles. Haha.

I recommend " Legend of Rebirth." This was a super classic urban rebirth novel written by Zhou Xingwen. It could be considered the first generation of the rebirth genre. 2004, 810,000 words. The story was set in 2003 when the protagonist returned to 1986 when he was three years old for ridiculous reasons. The events of the next 20 years changed from known to unknown. Although this book was old, it was still very good. The style, story, and logic were not inferior to similar novels in recent years. It was the first novel of Qidian Rebirth and influenced many later works. The emotional description was very pure. The single female lead was not brainless. The protagonist was full of literary temperament. The rhythm of the writing was bright, and the three views were encouraging. It was a very deep reflection on life and was full of memories. It was the first rebirth novel that many people read, and it was very worth reading. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Yousan Ointment had the effects of stopping bleeding, relieving pain, reducing swelling, relieving itching, resisting infection, accelerating wound healing, and improving human immunity. When using it, apply a thin layer of the ointment twice a day on the focus and its surrounding area five times the size of the focus. It is necessary to avoid the wound and avoid contact with the eyeball. However, due to individual differences, the speed and degree of effectiveness will vary. If there is a situation where redness and swelling worsen, it is recommended to see a doctor in time.