A Cloud of Hope and Danger

    In 2050, a small cloud floats through the air in a hospital operating room(手术室). In the room a patient, suffering from cancer, lies on a table. The cloud surrounds (包围) the patient, her body and filling her lungs (肺). The cloud is not smoke or steam. It is made of millions of microscopic robots called nano-robots(纳米机器人). These tiny robots move from cell(细胞) to cell in the body, destroying the cancer cells.

    Fighting cancer with nano-robots is only an idea today, scientists say that it would be possible in the future. Using nano-robots for good purposes such as fighting disease or repairing the environment may be the to many of today's problems.

    However, nano-robots could be a risk as well. Since nano-robots are so tiny, they will have to work in large teams of many thousands to 'many millions. For this reason, nano robots will have to be programmed to build . Scientists will not have the ability to build millions of nano-robots one by one.

    This to reproduce(复制)is making some scientists worried. What if something goes wrong in the programming? Quite a lot of crazy nan-orobots would be far than any disease. Some people think that if they get out of control, nan-orobots could destroy the Earth.

    What should be done? Should we continuenan-orobots or should we search for other methods? This is one of the many difficult that we have to make in the future.

Mom often says, "Cooking is an important skill, and it can be fun!" But I had no interest in cooking at all  I met with a cooking app（应用软件）. There are different kinds of recipes（菜谱）in the app. They offer detailed instructions  users can follow them step by step. Most of them even include photos or videos, which are quite useful for beginners. Last week, I picked up a popular recipe to cook fish. When I  , it was exactly what I wanted and tasted delicious. Then I tried more recipes. Now I can cook a couple of  . I find cooking is great fun and it seems that I  cooking. My plan is to invite my friends over next weekend and show them my new skills. I hope they will like my cooking.

Today, we still have some environmental problems. As a middle school student, we should do something to improve more environmental .

On the one hand, we ourselvesdestroy the environment, such as throwing the rubbish about. We canpart in some commonweal（公益）activities to plant more trees, for the trees are good to our environment. On the other hand, if someone does harm to the environment, like spitting on the ground or stepping on the grass, we can stop them from so, If there's a factory which destroys the environment, we can tell the relative（相关）department or the police about it.

All in all,  we are students, we can still do a lot to protect our environment, and we should take action from now on.

When the other models appeared on the stage, the audience cheered and clapped. Then it was Niu's turn. The audience suddenly became . However, after four or five seconds, Niu heard someone next to the stage say in admiration, "So cool!"

Niu Yu, 24, became a(n) star at Shanghai Fashion Week for her confidence, even though she was wearing a prosthetic leg. When Niu was only 11, she lost her right leg during the Wenchuan Earthquake.

Niu has won lots of praise. This gives those who have prejudice(偏见)against the disabled a hit on the nose. "I by something they said. They said the traditional view was that sports were for people with legs, but sports should be a kind of spirit. Even though I have lost a leg, I still deeply love sports and will do so forever, " Niu said. Actually, Niu first drew the public's attention when she a marathon — a 42-kilometer race in 2018, which was held in Wenchuan to mark the anniversary （周年纪念）of the earthquake.

Now, Niu works as a photographer and has more than 850,000 on social platforms, such as Douyin. "I feel I have a social responsibility to bridge the disabled and the public. Showing my life to the public can allow them to understand our group and can also tell other disabled people that our society is more tolerant（宽容）than they imagined, " she explained.

In Mianning, Liangshan, the village doctor Ma Li is at the health center by herself. On the door is her phone number. She is on call as long as the villagers fall ill.

When Ma Li arrived at the village for the time, she was completely shocked. As a doctor, she felt very sad to learn that women often died getting medical care in time when they gave birth to children. It was just because hospital was nearby. So she made a decision to help them.

Many years has passed, Ma Li is still sticking to her work. Every day she gets up early and hard. She sees at least 10 patients, sometimes even 30 or 40. It may be many walk to a patient's home. It's dangerous to walk on those mountain roads. It is not easy for a woman. People often ask she is afraid. Ma Li says she is a daughter of the mountains, she has been used to life here. And she says the number of village doctors like her is about 1.3 million in China.

Since a targeted poverty relief project (精准扶贫) was introduced to the village, have made efforts to develop the village and the results are . There are lots of changes—a new health station is being built in the village, a bridge across the river is standing over the river...

As a daughter of the mountains, Ma Li is happy these changes. She will continue to be a village doctor in the mountains. She is a beautiful flower deeply grown in the mountains.

Zhang Junli, an amazing woman, is from Taiyuan, Shanxi Province. She has overcome life's greatest difficulties to become one of the most famous in China. She has been paralyzed (瘫痪的) for over 30 years. When she was six, Zhang had a illness. At eight, she could not move 90% of her body. She can only her shoulders and neck a little now. However, being paralyzed never prevented her from to follow her dreams. Zhang took up drawing at a young age and learning painting in 2015. Though it is hard for her to pick a paintbrush, her love for painting is pushing her to challenge herself.

"Painting has changed me. The first time I picked up a brush, I felt that I liked to draw, " says Zhang. "The world is so beautiful. Even if I am in poor , I don't want to give up the chance to live". Now Zhang has created thousands pencil sketches (素描). She also has an online shop Zhang Junli's Paintings, where she sells her works.

Zhang wants to use her to encourage those who are like her, and to tell them never to give up. "Instead of crying and worrying all day, find your meaning in life. Live in the present, " says Zhang, a true inspiration.