Enough sleep is important to health. The amount of sleep needed depends on the age of the person and the conditions in which sleep takes place. The young may need more sleep than the old, but usually eight hours are enough for the health of grown-ups. Some can do with less than this amount, but others may need more. Every person knows his own need. It is then a matter of good judgement to satisfy his need. Sleep should always be enough to make one bring back his strength and get ready for a day's work.

    Fresh air is necessary to sound sleep. It is not without reason for some people to think that it is practicable to sleep in the open air. When one can keep himself warm, out-of-door sleeping probably gives the body its most complete relaxation (放松).

    Ability (能力) to sleep lies largely in habit. The conditions referred to only lead to sleep. Out-of-door exercises, a good habit of regular hours and the avoidance (避免) of late eating and worry, which are largely within the control of any person, are all helpful to sound sleep.

    A bath at bedtime, neither hot nor cool but of body temperature may be helpful to sleep. Sleep-producing drug (药) should never be taken except when suggested by a doctor.

     Many of us feel uneasy when someone stands too close to us, talks to us too loudly or makes eye contact(接触) with us for too long. But have you ever wondered why those things make you uncomfortable?
      It's all about personal peace, which means not only an imaginary space around the body, but also the space around all the senses. People feel that their space is being violated(侵犯) when they meet with an unwelcome sound, smell or look. This is probably why a man on a crowded bus shouting into his mobile phone or a woman next to you putting on strong perfume(香水) makes you feel angry.

    Whether people have had a stronger wish to protect their personal space in recent times is hard to say. Yet studies of airlines show that people have a strong desire to have space to themselves. In a survey by Trip Advisor, a travel website, people said that if they had to pay more for some extra service, they would rather have larger seats than extra food.

    Although people may need their personal space, some hardly realize it. For example, people on a bus who hold newspapers in front of their faces to read in fact keep a distance from strangers.

    Go and watch a library table. You will notice that one of the corner seats will usually be taken first, because they are the farthest way. What if someone sits opposite to you? Maybe you will pile up books as if to make a wall.

    Preference for personal space is different from culture to culture. Scientists have found that Americans generally prefer more personal space than people from other cultures. In Latin cultures, however, people are more comfortable standing close to each other.

    Sure it's good to get along with your teacher because it makes the time you spend in the classroom more pleasant.

    And yes, it's good to get along with your teacher because in general it's smart to learn how to understand the different types of people you'll meet throughout your life.

    "But really there's one super-important reason why you should get along with your teacher. When you do learning bursts right open " says Evelyn Vuko a longtime teacher who writes an education column(专栏) called "Teacher Says" for the Washington Post newspaper.

    In fact, kids, who get along with their teachers not only learn more but they're more comfortable asking questions and getting extra help. This makes it easier to understand new material and do your best on tests. When you have this kind of relationship with a teacher he or she can be someone to turn to with problems such as problems with learning or school life such as bullying.

    As a kid in a primary or middle school you're at a wonderful stage in your life. You're like a sponge (海绵) able to absorb lots of new and exciting information. On top of that you're able to think about all this information in new ways. Your teacher knows that in most cases is very excited to be the person who's giving you all that material and helping you make it. Remember teachers are people too and they feel great if you're open to what they're teaching you. That's why they wanted to be teachers in the first place-to teach!

    Some kids may be able to learn in any situation whether they like the teacher or not. But most kids are sensitive to the way they get along with the teacher and if things aren't going well they won't learn as well and won't enjoy being in class.

    In the winter months the temperature in most of Canada usually stays below 0℃. However, in some parts of Canada, such as southern British Columbia, the temperature rarely goes below 0℃. In most areas where people live, snow will be on the ground from mid-December to mid-March. Though Canada's winter may be much colder and longer than you are used to, it can be very enjoyable. For many Canadians, being active in winter is an important part of enjoying life. There are many outdoor winter activities, including skiing, ice fishing, walking, and skating. Joining in one of these activities may help you appreciate winter and enjoy your time outside in the snow.

    Dressing for winter

    During winter in Canada, you will need warm clothing. If possible, arrive with these items or be prepared to buy them soon after your arrival. You will need:

    a warm waterproof boots   ☆ a scarf for your neck

    a hat that covers your ears  ☆ gloves for your hands

    thick winter coats, pants and sweaters

    Layers keep you warm

    It's a good idea to layer your clothing by, for example, wearing a T-shirt and a sweater underneath a jacket. If you become too hot, it's always easier to remove a piece of clothing than to add another. On the West Coast, prepare to dress for cool rainy or snowy weather. You will need:

    a warm waterproof coat   ☆ waterproof hats

    an umbrella    ☆ rain boots or snow boots

    Learn more about weather and seasons across Canada. You can also contact Related Links, for example, an immigrant-serving organization in the community where you live for more information about dressing for winter.

In early February 2019, 51-year-old Rainer Schimpf and his team set out to film South Africa's famous Sardine Run off the coast of Port Elizabeth. The migration of billions of South African sardines, is a big draw for hunters, especially seabirds and dolphins. The two species work together to herd the large group of fish into smaller shoals (浅滩), which are then eaten by not just the birds and the dolphins, but also sharks and Bryde's whales.

In an attempt to find the best scene of the amazing natural phenomenon, which has been the subject of many films, Rainer got into the middle of a swirling ball of fish. Suddenly the sea churned (翻腾), and the experienced diver and his photographer Heinz Toperczer, who was filming from the boat, instantly realized something strange was going on.

Toperczer later said, "As Rainer moved towards the shoals, suddenly the water churned widely up, dolphins shot out of the water and then a whale appeared and caught him!"

Rainer, who was swallowed in darkness inside the whale's mouth, was trying to survive. "I held my breath because I thought he was going to dive down and release me much deeper in the ocean," the diver said.

Fortunately for Rainer, the whale quickly realized he was no sardine! "I felt huge pressure around my waist (腰部) which is when I guess the whale realized his mistake," he said. "As the whale turned sideways, he opened his mouth slightly to release me, and I was washed out, together with tons of water, of his mouth." Though the entire event lasted just 1. 8 seconds, it felt like a century to Rainer.

Still holding his underwater camera, the diver swam to his boat, where he was quickly rescued by the members of the team. The terrifying adventure did not worry Rainer for too long. After checking to ensure he had no injuries, the diver returned to the water. Fortunately, the rest of the adventure went peacefully.

Many got sleepless nights after Sora amazed the world with its remarkable ability of creating videos directly from text instructions. Discussions about what the artificial intelligence model can do and make a difference continue.

Some said it could give a huge blow to traditional industries such as film and television making, looking forward to the day when a movie can be created right after a novel is put into the model. But others remain skeptical about how powerful the model can be in changing the landscape of AI application. 

Developed by a group of young talent from Microsoft-backed company OpenAI, the text-to-video model can generate videos up to a minute long while maintaining visual quality and adherence to the user's prompt.

Shen Yang, a professor at the School of Journalism and Communication, Tsinghua University , said, "Sora represents a revolutionary leap in the field of AI-generated content (AIGC)." 

As one of the leading scholars in AI research in China, Shen leads a team that studies the philosophy of AI. Until he learned about Sora on February 16, Shen was quite satisfied with his team's AI-generated videos. A two-minute video on the Spring Festival produced by Shen's team have recently won many likes on social media platforms. "Compared with the new model Sora, what we used are tools of the previous generation. There's a huge gap in between," said Shen.

As a frequent user of AI, Shen said the technology not only helps improve his productivity, but also benefits his daily life. His wife was suffering from cancer and many complications, and he used AI to assist in finding treatment, which has remarkably prolonged her life. He even wrote an award-winning science fiction novel using AI.

However, new technologies do not mean good news to everyone. Many also concern about AI models' safety issues since related regulations are lagging behind. 

Sora is going to bring changes in many fields, including short video, film and television, news, games, advertising, education, and even industrial manufacturing, according to Shen. There is still much room to improve AI models. For instance, current AI models are not capable of drawing characters accurately and quickly. Shop signs lack meaning in Sora's demo video showing a woman walking down a street in Tokyo. But these problems are believed to be solved as models update.