Ladies and gentlemen, I returned to this year in a time machine. In the year 2500, we are able to travel through time to any year in the history of the earth. This year is your last chance to change your lifestyle to save the earth.

    Beginning in the middle of the 20th century, a few people were worried about polluting the earth's water and air, but most people did not change their way of life.  Instead, they continued to pour(倒) dangerous chemicals and other waste into lakes and seas, to drive more and more cars and trucks, and to cut down trees.

By the year 2200, the earth's water was completely polluted. Scientists said that in the future there might be too many people on the earth. People could no longer drink water, and they had to use other types of liquids(液体).

So, by the year 2300, there were so many people that food became scarce. There was no water to grow food and all of the fish in the lakes and seas died because of pollution Terrier wars(战争) broke out between the rich and the poor. Scientists were working very hard to find another planet in space where humans could live on.

By the year 2400, the air was too polluted for humans to breathe. So we had to leave earth but only the rich were able to leave. Where did we go? Nowhere. And everywhere. You see scientists did not find another safe planet, so now we must travel around the universe in our space ships. We are still looking for a place to call our home.

    So, it is up to you to change history. There is still hope. You must change your lifestyle now, before it is too late.

    There are many wetlands in China and some of them have become the world's important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. They are home for many different kinds of animals. The world's largest Milu Deer Nature Reserve is in them. More than 700 Milu deer live freely there. There are not many red-crowned cranes in the world, but every winter you can see some in the Red-crowned Crane Nature Reserve in the Yellow Sea Wetlands.

The temperature in the wetlands is usually neither too high nor too low. There is a lot of rain and sunshine, too. They are really good places for wildlife. Offering(提供) food and home for some special kinds of animals is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent flood. But some people want to change the wetlands to make more space for farms and less space for wildlife.

    Luckily, more and more people are beginning to realize the importance of wetlands and wildlife. Every year, on February 2nd, many activities are held to tell people more about wetlands.

    Artificial intelligence (AI, 人工智能) can help us make phone calls. It can guide us to where we want to go. It can play games. And now, AI can do even more things.

    Researchers from Microsoft have created the first machine translation system that can translate news articles from Chinese to English, Business Standard reported.

    According to Microsoft's official website, researchers tested the system by asking it to translate hundreds of sentences taken from news stories. Then, language experts compared the results to two translations that were done by humans. The experts concluded that the system's translations were as good as the human translations.

    Machine translation is always challenging. This is partly because different words can be used to express the same meaning. It can be hard to say which word is more “correct”.

    Experts used several methods to improve the system's translation abilities. “Much of our research is really inspired (得到启发) by how we humans do things,” lead researcher Liu Tieyan said.

    One method is called dual learning. In this method, the system translates every sentence from Chinese to English, as well as translates the sentences back from English into Chinese. This way, the system can improve itself and learn from its own mistakes. This is similar to what humans do to make sure their translations are accurate (准确的).

    Another method makes use of deliberation networks . The researchers taught the system to repeat the process of translating the same sentence over and over. Gradually, the system can improve the quality of its translations. This is similar to how people revise their own writing by going through it again and again.

    Are you still worried about how to get your phone charged (充电) ? Now, a 19-year-old teenager can help you to solve this problem. He has invented a phone charger which uses energy from your own body to charge your phone.

    Hand Energy, the wonderful invention of the inventor Miehael Vaga, allows you to charge your phone simply by shaking your hand, which starts the charger's gyroscope(陀螺仪) to produce electricity. And the electricity can then either be stored or used to charge a mobile immediately (立即).

    He said, " With each rotation (旋转) of your hand, the gyroscope's speed increases quickly and produces more power. The average (平均的) speed of the gyroscope is about 5, 000 rounds per minute. With this small charger, your physical energy can be turned into electrical energy and this means you can charge your phone. "

    Hand Energy can help you produce endless electricity.  You can use it everywhere you want. It is especially useful for people who have to spend a long time in the wild. What's more, it's friendly to the environment and helps you to exercise your wrists. It takes between 40 minutes and one hour to fully charge the batteries(电池) in Hand Energy.

    The invention took Vaga a year to develop. Now, the inventor from Minsk, Belarus, is ready to put it into production and send out the creative convenient chargers.

    It is important for us to look after the Earth well. The Earth gives us a lot of things. We also give the Earth a lot, but some of the things are not good.

    In nature, when something dies, other animals and plants get food from it. Every animal or plant provides food for other animals or plants. However, animals can't get food from many of the things that we"give" the Earth. Animals and plants can't cat metal, plastic or glass. These things will stay in the ground for many, many, many years.

    Some rubbish is very dangerous for plants and animals. In some places, many animals live together. One animal makes food for many other animals. If we throw rubbish and chemicals into the water, the plankton（浮游生物）can die. If there isn't any plankton, many animals have nothing to eat.

    So what can we do? Don't leave any rubbish in the countryside! Don't make so much rubbish.