Dolphins(海豚) live in a dark underwater world. It's often impossible to see each other or anything else around them, so sound plays an important role in their survival. To communicate with each other, dolphins produce all kinds of sounds.

    Only other dolphins understand what the sounds mean. Scientists haven't uncovered their secret communication, except for one kind of whistle. It might last less than a second, but this whistle is a big deal. Why? Because these whistles are actually names of dolphins - and every dolphin has one. Scientists call these sounds a “signature whistle.” When other dolphins hear the whistle, they know which dolphin is calling.

    Dolphins often hunt by themselves but still need to stay connected to the group. Since they can't always see each other, dolphins use their signature whistles to check in with other dolphins hundreds of yards away. “In coastal areas, dolphins exchange whistles even when they're a third of a mile apart,” says Greg Campbell, who studies animals. That means dolphins shout out to group members that might be nearly five football fields away.

    What's amazing is who names the baby dolphin. Not the mother. Not an auntie dolphin or another group member. Scientists believe the baby dolphin itself comes up with the signature whistle. Like human babies, a baby dolphin plays with sounds throughout its first year. While testing its sound skills, a baby dolphin is doing something amazing. It's creating or figuring out its signature whistle. How or why it chooses its signature whistle is not clear. Studies show that most of the time the signature whistle is nothing like its mother's or group members' whistles.

    When the baby dolphin is about a year old, its signature whistle is set. It repeats it often so the other dolphins learn to recognize it.

    Deciphering(破译) dolphin names is just the beginning of figuring out what dolphins communicate about. Do they chat about sharks? Discuss the tides? Maybe they even have a name for people. Someday scientists are to decipher the rest of dolphins' communication.

    Primary schools could be told to remove some traditional subject-based lessons and replace them with “personal development” classes to encourage children to improve their social and practical skill. Parents, teachers and pupils, who took part in the investigation carried out for the biggest ever official review of the primary curriculum, argued that the number of subjects taught to very young people should be reduced.

    The review, being conducted by the government's school's director Sir Jim Rose, will consider how to redesign the primary school day to handle concerns that too many pupils leave primary school unable to read, write and do maths at the level expected of them. It will also address criticisms that pupils are expected to study so many subjects there is little time for creative learning.

    The 60 focus groups brought together 1,500 parents, pupils and school staff and is expected to heavily influence the thinking of the Rose review, which the government is promising to back. Instead of a broad range of subjects, pupils should study in-depth literacy and maths lessons alongside a more creative curriculum that encourages pupils to develop personal, learning and thinking skills, they say. Such lessons might include “healthy lifestyles, sex and relationships education, drugs and alcohol education”.

    “Child and personal development as priorities have been shamefully neglected in recent years in the rush to hit targets in the basics.” John Bangs, head of education at the National Union of Teachers, said, “The worst thing would be to evaluate child development through the current high stakes testing system. That would weaken the capacity of teachers to meet children's unique needs.”

    However, the shadow schools minister, Nick Gibb, said, “If lessons on lifestyle are given the same status as traditional subjects, it is the most disadvantaged children who will be worst affected.” “Children are not able to personally develop and succeed in the future if they don't have a grasp of basic subjects such as maths and English early on in primary school. Removing high requirement from the primary curriculum would increase the inequality gap between less well-off pupils and the rest.” Nick added. A spokeswoman for the Department for Children, Schools and Families (DCSF) said, “This is a summary of stake holder's view, not the views of the Qualifications and Curriculum Authority or the DCSF, and has been submitted to Sir Jim Rose's review as evidence to consider.”

    Animals, including insects, do not have a language like ours. They do not talk to each other in words and sentences. But if we watch them, we can see that they do have ways of communicating with each other.

    Can you see the rabbits' tail? When rabbits see this white tail moving up and down, they run too. The rabbit has reminded them of potential dangers without making a sound. It has given them a signal.

    Many other animals use this kind of language. When a cobra (眼镜蛇) is angry, it raises its hood (兜帽) and makes itself look fierce. This warns other animals. When a bee has found some food, it goes back to its home. It cannot tell the other bees where the food is by speaking to them, but it does a little dance in the air. This tells the bees where the food is.

    Some animals say things by making sound. A dog barks, for example, when a stranger comes near. A cat purrs (猫的呜呜声) when pleased. Some birds make several different sounds, each with its own meaning. Sometimes we human beings speak in the same way. We make sounds like “Oh” or “Ah!” when we are frightened or pleased or when we drop something on our toes.

    But we have something that no animals have — a large number of words which have the meanings of things, actions, feeling or ideas. We are able to give each other all kinds of different information in words and sentences, which no other animals can do. No other animals have so wonderful a language as we have.

    Visit one of the most outstanding prehistoric sites in the United Kingdom, and enjoy amazing historic English attractions. Please notice that every tour starts and ends in London. Have a tour with visiting Britain.

    Stonehenge Direct Tour

    Visit one of the most outstanding prehistoric sites in England and in the world: Stonehenge.

    Duration：1 day

    Price：Adults ￡29.99，Children ￡28.99

    Stonehenge and Bath Tour

    Enjoy a late breakfast before heading to the Stonehenge site and end your day with an original visit to the Roman Baths.

    Duration：10 hours(departure 10：30 a．m.，return 8：30 p．m.)

    Price：Adults ￡64，Children ￡60

    Stonehenge, Bath and Windsor Castle Tour

    Explore three of England's most popular sites to visit: Windsor Castle, Stonehenge and the Roman Baths.

    Duration：1 day(return 8：30 p．m.)

    Price：Adults ￡64.80, Children ￡61.20

    Stonehenge, Lacock and Bath Tour

    Come and feel the warmth of Bath, see the pleasant village of Lacock, and solve the mystery of Stonehenge.

    Duration：1 day(return 6 p．m.)

    Price：Adults ￡85，Children ￡78

    Stonehenge, Windsor and Oxford Tour

    Choose Stonehenge ，Windsor and Oxford Tour and enjoy ancient mysticism, royal history and illustrious knowledge.

    Duration：1 day

    Price：Adults ￡72, Children ￡68

    Stonehenge, Bath and Stratford Tour

    Take a tour to make the most of the English historic attractions：the Stonehenge site, Bath and Stratford, the birthplace of playwright William Shakespeare.

    Duration：1 day(return 8 p．m.)

    Price：Adults ￡79, Children ￡68

Riding School:

    You can start horse-riding at any age. Choose private or group lessons any weekday. There are 10 kilometers of tracks and paths for leisurely rides across farmland and open country. You will need a riding hat.

    Opening Hours: Monday through Friday: 9:00 a.m.-8:30 p.m. (3:30 p.m. on Saturdays)

    Phone: (412)396-6754 Fax:(412)396-6752

Sailing Club:

   Our Young Sailor's Course leads to the Stage 1 Sailing qualification. You will learn how to sail safely and the course also covers sailing theory and first aid. Have fun with other course members afterwards in the clubroom. There are 10 weekly two-hour lessons.

    Opening Hours: Tuesdays: 6:00 p.m.-8:00 p.m.

    Phone:(412)396-6644    Fax:(412)396-6644

Diving Centre:

    Our experienced instructors offer one-month courses in deep-sea diving for beginners. There are two evening lessons a week, in which you learn to breathe underwater and use the equipment safely. You only need swimming costume and a towel. Reduced rates for couples.

    Opening Hours: Monday and Friday: 6:30 p.m.-8:30 p.m.

    Phone:(412)396-6312    Fax:(412)396-6706

Medical Center:

    The staff of the Medical Center aim to provide convenient and comprehensive medical care to students and staff of the university. The center is well equipped and the staff here are trained to deal with a broad range of medical problems. Both female and male doctors as well as nursing staff are available for consultation. Also, all kinds of medicines are sold here and are cheaper for students than other drugstores.

    Opening Hours: 24 hours from Monday to Sunday

    Phone:(412)396-6649    Fax:(412)396-6648

Water sports Club:

    We use a two-kilometer length of river for speedboat racing, and water-skiing. A beginners' course consists of ten 20-minute lessons. You will learn to handle boats safely and confidently, but must be able to swim. The club is in a convenient central position and is open daily from 9 a.m. to 4 p.m., with lessons all through the day.

    Opening Hours: Monday through Friday: 9:00 a.m.-4:00 p.m.

    Phone:(412)396-6899    Fax:(412)396-6890

    On average, Americans spend about 10 hours a day in front of a computer or other electronic devices and less than 30 minutes a day outdoors. That is a claim made by David Strayer, a professor of psychology at the University of Utah. In his 2017 TED Talk, Strayer explained that all this time spent with technology is making our brains tired.

    Using an electronic device to answer emails, listen to the news and look at Facebook puts a lot of pressure on the front of the brain, which, Strayer explains, is important for critical thinking, problem­solving and decision­making.

    So, it is important to give the brain a rest. And being in nature, Strayer claims, helps get a tired brain away from too much technology. More than 15,000 campers from around the world attended an international camping festival in September. That is when friends and family take time off and escape to nature for several days. They take walks, climb, explore, swim, sleep, eat and play. Camping may be just what a tired brain needs.

    Take Carl for example. He lives in West Virginia and enjoys camping. He says that staying outdoors makes him feel at ease. It also prepares him for the work he must do. Kate Somers is another example who also lives in West Virginia. She says she enjoys camping with her husband and two children. She calls it a "regenerative" experience.

    At the University of Utah, David Strayer has studied both short­term and long­term exposure to nature. He found that spending short amounts of time in nature without technology does calm the brain and helps it to remember better. However ,he found, it is the long­term contact with nature that does the most good. He and his research team found that spending three days in nature without any technology is enough time for the brain to fully relax and reset itself.