In colonies (群体) that range in size from a few hundred to tens of millions, they organize their lives with a clear division of labor. Even more amazing is how they achievethis level of organization. Where we use sound and sight to communicate, ants dependprimarily on pheromone (外激素), chemicals sent out by individuals and smelled or tastedby fellow members of their colony. When an ant finds food, it produces a pheromone that will lead others straight to where the food is. When an individual ant comes under attack or is dying, it sends out an alarm pheromone to warn the colony to prepare for a conflict as a defense unit.

         In fact, when it comes to the art of war, ants have no equal. They are completely fearless and will readily take on a creature much larger than themselves, attacking in large groups and overcoming their target. Such is their devotion to the common good of the colony that not only soldier ants but also worker ants will sacrifice their lives to help defeat an enemy.

         Behaving in this selfless and devoted manner, these little creatures have survived on Earth, for more than 140 million years, far longer than dinosaurs. Because they think as one, they have a collective (集体的) intelligence greater than you would expect from itsindividual parts.

    Learning English is challenging because of the various rules and exceptions to the rules. The best way to learn English is to hear it spoken and repeat the words as you hear them. {#blank#}1{#/blank#}You will learn how to make English a daily part of your life in order to learn to speak it quickly.

    {#blank#}2{#/blank#} Ask a friend to help you write letters of English alphabet on index cards. You should write a letter on each card. Practise the letters by mixing up the cards and saying the letters. You can ask your friend to help you pronounce the letters and quiz you on your knowledge.

    Make your own videos in English. If you have a video camera, you can tape yourself speaking English and practice along with your own video. {#blank#}3{#/blank#} Watch your videos daily, and repeat what is being said.

    Get a private tutor. A professional English instructor can give you one-on-one instruction that will help you understand the rules of English. Your instructor can teach you how to write and speak English.  {#blank#}4{#/blank#} You can also inquire at your local community college.

    Watch movies with English subtitles. When watching a movie in your native language, use the English subtitles so you will understand the connection between your language and English.

    {#blank#}5{#/blank#} You will make mistakes, and that is OK. You need to practice English as much as possible in order to quickly learn to speak the language fluently.

    Why Do Dogs Watch--and React to--TV?

    Domestic dogs can perceive images on television similarly to the way we do, and they are intelligent enough to recognize onscreen images of animals as they would in real life-even animals they've never seen before-and to recognize TV dog sounds, like barking.

    A 2013 study published in the journal Animal Cognition showed that dogs could identify images of other dogs among pictures of humans and other animals, using their visual sense alone.

    However, there are some differences between ourselves and man's best friend-for one, dogs' eyes register images more quickly than do ours. So older television sets, which show fewer frames(帧数) per second than modern televisions, would appear to a dog to be flickering(忽隐忽现的) like a "1920s movie," said Nicholas Dodman, a veterinary behaviorist(动物行为学家) at Tufts University, in Massachusetts.

    Dogs also have dichromatic vision, which means they see a range of two primary colors, yellow and blue. Human vision is trichromatic, so we see the full range of colors, according to Binghamton University's Ask a Scientist web page.

DogTV, an HDTV cable channel designed for dogs, interests canines(犬) because HDTV has a much higher number of frames per second and is specially colored to accommodate dogs' dichromatic vision, said Dodman, who is the channel's chief scientist.

    DogTV has modes for relaxation, which shows images like dogs recreate themselves in a grassy field; stimulation, which depicts scenes like dogs surfing in southern California; and exposure which shows things like a dog reacting to a ringing doorbell and obeying commands to adapt to such situations at home.

    “Most children,” Asher Svidensky says, “are a little afraid of golden eagles. However, Kazakh boys in western Mongolia start learning how to use the huge birds to hunt for foxes and hares at the age of 13.” Svidensky, a photographer and travel writer, shot five boys learning the skill as well as the girl, Ashol Pan. “To see her with the eagle was amazing,” he recalls. “She was a lot more comfortable with it, a lot more powerful with it and a lot more at ease with it.”

    The Kazakhs in western Mongolia are the only people that hunt with golden eagles, and today there are around 400 practising eagle hunters. Ashol Pan, the daughter of a famous hunter, may well be the country's only girl hunter.

    They hunt in winter, when the temperatures can drop to -40℃. A hunt begins with days of traveling on horseback through a snow mountain or ridge (山脉) giving an excellent view of prey for miles around. Hunters generally work in teams. After a fox is discovered, riders rush to frighten it into the open, and an eagle is released (释放). If the eagle fails to make a kill, another is released.

     “The skill of hunting with eagles,” Svidensky says, “lies in bringing an unexpected force of nature under control. You don't really control the eagle. You can try and make her hunt an animal, and then it's a matter of nature. What will the eagle do? Will she make it? How will you get her back afterwards?”

    Svidensky describes Ashol Pan as a smiling, sweet and shy girl. “Ashol Pan stands for something about Mongolia in the 21^st century,” says Svidensky. “Everything there is going to change and is going to be redefined (重新定义), and the possibility is amazing.”

    Back in 2009, China was wrongly accused by the West of "controlling" the Copenhagen talks on climate change. By then China had truly carried out strict policies to reduce the energy consumption of economic activities and at the international level, the top Chinese leaders participated in round-clock efforts to cooperate with the major players to build a united front for efforts to solve global warming. But China was finally misjudged.

    This misjudgment caused China's scholars to rethink China's climate change communicative ways. Among them was Zheng Baowei, journalism professor of Renmin University of China, who realized China had to better shape its communication on its environmental protection.

    Delightfully, the efforts have paid off. Zheng set up a top-level international group advising his research team. He is in charge of doctoral candidates on climate change communication. Climate awareness surveys have been conducted, and a package of communication tools has been designed. Many seminars have been arranged.

    Recently, he arranged a seminar on climate change and health communication on the changing situation both in China and the world. First of all, this stressed that China's policy has developed from reducing its energy consumption and pollution prevention to the important goals of achieving a "Beautiful China" and "'Healthy China, "while coming up with plans to realize an ecological civilization since late 2012. With such goals, China played a leading role in securing the Paris climate change deal in 2015 together with the United States and European Union. In Paris, China promised to let out its carbon to the maximum in 2030.

    It is a demanding job communicating climate change and other topics of lasting development well. Despite that, some foreign scholars have realized China's smart ways in presenting the green concepts. They appreciated China's idea of building a "Beautiful China" and "Healthy China" and said it can he expanded into an idea of a "Beautiful World" and "Healthy World".

    Looking back from how China had followed the steps of the industrialized countries in advocating climate fight, people find now its own green ideas are being recognized.

After nearly two months of relative silence among new waves ofCOVID-19 pandemic infection in Japan, organizers of Tokyo Olympics on Wednesday released the first of playbooks that will instruct athletes, officials and members of the news media on the procedures they must follow at the rescheduled Games.

Already delayed by a year, the opening ceremony is now a little more than 120 days away. Organizers must find a way to accommodate and ensure the safety of more than 10,000 athletes who view this summer as the result of years of sacrifice and training.

For now, the best that organizers could offer were the outlines of a plan. Athletes and other attendees will not be required to be vaccinated (接种疫苗) or to quarantine (隔离) on arrival in Japan, but they will be subject to severe restrictions on movement and socializing. All athletes will be required to test negative for COVID-19 within 72 hours of their departure for Japan and give in to another test on arrival.

The organizers said the documents were not an end. They would wait until spring to decide if audiences will be permitted to travel to Tokyo. If fans are eventually allowed to attend, the documents suggest they be asked to express support for athletes only in the form of clapping, rather than singing or chanting. To track outbreaks, visitors from abroad will have to file a list of everyone they have close contact with during that initial 14-day period.

Olympic officials see some reason for optimism. In many parts of the world, professional sporting events have been held for months, though often with very few or no spectators at all, and nothing as large as the Summer Games.