Liverpool, my hometown, is a special city. It is so unique that in 2004 it became a World Heritage（遗产）Site.

    I recently returned to my home city and my first stop was at a museum on the River Mersey. Blanketed in mist（薄雾），Victorian architecture rose from the banks of the river, responded to the sounds of sea-birds, and appeared unbelievably charming. When I headed toward the centre, I found myself surrounded by buildings that mirror the best palaces of Europe. It is not hard to imagine why, on first seeing the city, most visitors would be overpowered by the beauty of the noble buildings, which are solid signs of Liverpool's history.

    As if to stress its cultural role, Liverpool has more museums and galleries than most cities in Britain. At Walker Art Gallery, I was told that it has the best collections of Victorian paintings in the world, and is the home of modern art in the north of England. However, culture is more than galleries. Liverpool offers many music events. As Britain's No. 1 music city, it has the biggest city music festival in Europe, and its musicians are famous all over the world. Liverpool is also well-known for its football and other sports events. Every year, the Mersey River Festival attracts thousands of visitors, making the city a place of wonder.

    As you would expect from such a city, there are restaurants serving food from around the world. When my trip was about to complete, I chose to rest my legs in Liverpool's famous Philharmonic pub（酒馆）. It is a monument to perfection, and a heritage attraction itself.

    Being a World Heritage Site, my home city is certainly a place of “outstanding universal value”. It is a treasure house with plenty of secrets for the world to explore.

    Crown shyness (树冠羞避) is a mysterious natural phenomenon in which the crowns of some tree species do not touch each other, but get separated by a gap clearly seen from ground level. The effect usually occurs between trees of the same species, but has also been observed between trees of different species.

    There are many theories going around, most of which make sense, but no one has been able to prove without the shadow of a doubt why some trees avoid touching each other.

    In his 1955 book Growth Habits of the Eucalypts, Australian forester M. R. Jacobs writes that the growing tips of the trees are sensitive to abrasion (擦伤), which results in crown shyness phenomenon. This theory was also supported by Dr. Miguel Franco. Some experiments have shown that if trees displaying crown shyness are artificially prevented from swaying (摇摆)in the wind and touching each other, they gradually fill up the gaps between them.

    But while the above theory is arguably the most widespread, it's certainly not the only one. Some scientists have suggested that crown shyness is a mechanism to stop the spreading of leaf-eating insects. The gaps mean pests wouldn't be able to reach other trees, so they are the tree's natural defense method.

    One Malaysian scholar studied many trees, but found no traces of abrasions, despite their clear crown shyness. Instead, he suggests that the growing tips of the trees were sensitive to light levels and stopped growing when they got too close to other trees. Plants are able to sense how close they are to other plants and in order to get more light, they give off some chemical to stop other trees from growing too close.

    Whatever the reason, one thing is for sure, plants are more intelligent than people.

    Next morning, there was no wind and we were half a mile from the eastern coast of the island. Although the sun shone bright and hot, I hated the thought of Treasure Island, afraid of what would happen there.

    Guns were given to all the honest men. Hunter, Joyce, and Redruth were told what was happening, and were less surprised than we expected them to be. Then the captain went on deck to talk to the crew.

    They all became happier at once. I think they thought they would find the treasure lying around on the beach! After some talk, six men stayed on board, and the others, with Silver, got into the small boats.

    I then had the first of the mad ideas that help ed to save our lives. If six men were left, we could not take control of the ship; and because only six were left, the captain's men did not need my help. So I quickly went over the ship's side and into the nearest boat.

    No one took much notice of me, only one man saying, “Is that you, Jim?” But Silver called from the other boat, wanting to know if it was me. Then I began to worry if I had done the right thing.

    The crews rowed to the beach and our boat arrived first. I ran towards the trees. Silver and the rest were a hundred metres behind, and I heard him shouting, “Jim, Jim!” But I took no notice, pushing through trees and bushes, and ran until I could run no longer.

    I was pleased to lose Long John and began to enjoy looking around this strange island. I crossed wet ground and came to a long, open piece of sand, then went on to a place where the trees had branches that were thick and close to the sand.

    Just then I heard distant voices, Silver's among them, and hid behind a tree. Through the leaves, I saw Long John Silver and another of the crew talking together.

    “I'm warning you because I' m your friend, Tom,” Silver was saying.

    “Silver,” said Tom: “You're old and you're honest, or so men say; and you've money, too, which lots of poor seamen haven't. And you're brave. Why let yourself be led away with that kind of scoundrel? I'd rather die than—”

    Suddenly, there was a noise of distant shouting, then a long horrible scream. I had found one honest man here, and that terrible, distant scream told me of another．

    “John!” said Tom: “What was that?”

    “That?” replied Silver. His eyes shone like pieces of broken glass in the sun: “That'll be Alan.”

    “Alan!” cried poor Tom: “An honest and true seaman! John Silver, you've been a friend of mine, but for no longer. You've killed Alan, have you? Then kill me, too, if you can!”

    The brave man turned his back on Silver and began to walk back to the beach. With a shout, Silver threw his crutch through the air. It hit poor Tom between the   shoulders, and he fell to the ground with a cry.

    Passenger Information

    Carry-on Bag Rules

    When travelling on China Southern planes, we ask our customers to follow our simple bag rules.

    Each passenger is allowed to bring one bag onto the plane.

    Weight limit: Each carry-on bag may weigh up to 10 kilos.

    Size limit: Each carry-on bag can be up to 110cm long, 60cm high and 30cm wide.

    Additional bags and oversized/overweight bags may be allowed on the plane if there is enough room. There will be a fee for such bags (see the table below). Please note that if your bag breaks more than one rule then you must pay a fee for each rule broken.

    Safety Rules

    For the safety of our passengers, the following items must not be taken onto the plane:

    Bottles containing gas (e.g. cigarette lighter)

    Bottles containing any cream, oil or other liquid that are over 100ml.

    Note:

    If you have any liquid medicines over 100ml that you must use during your flight, please contact our customer service manager on 34533566 to make arrangements at least 24 hours before your departure. You will need to have a doctor's letter explaining why you need the medicine.

    Bag Fees

    No bag over 15 kilos will be allowed on the plane. **No bag over 150cm long or 80cm high may be taken on the plane. Passengers must put such bags in the plane's storage.

    The Z Hotel is in the heart of London's West End and has comfortable accommodation in a contemporary design.

    All rooms include handcrafted beds, 48-inch Samsung HD TVs with free Sky Sports and Movie channels, and free Wi-Fi. Each room also has under-bed storage for an overnight bag, and wall-mounted hanging space for clothing. The Z Hotel also offers wheelchair accessible rooms.

    Continental breakfast is served in The Z Cafe every morning, including smoked salmon, fresh bread, fresh fruit salad and bacon rolls. A selection of salads, sandwiches and hot dishes are on offer throughout the day.

    The hotel is a 5-minute walk from Prince of Wales Theatre and Chinatown London, Leicester Square, Piccadilly Circus and Trafalgar Square. Heathrow Airport can be reached directly from Piccadilly Circus Underground Station.

    This is our guests，favorite part of London, according to independent reviews. This area is also great for shopping, with popular brands nearby: Apple, H&M, Zara, Burberry and Chanel.

    The Z Hotel is rated for the best value in London! Guests are getting more for their money when compared to other hotels in this city. Come and stay with us!

    Most popular facilities:

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    When you think of batteries, you'll likely think about them powering up remote controls, cellphones, flashlights and toys. But some people carry a battery around in their body to power a pacemaker (起搏器). It isn't really pleasant and easy to carry batteries because they need to be replaced so often and they can leak poisonous chemicals. A battery-powered pacemaker may become a thing of the past, thanks to a new technology developed by UCLA researchers: A biological super capacitor (超级电容器) , which is thinner than several hairs.

    Teams of researchers at UCLA and the University of Connecticut published a paper in a journal explaining their new invention. The super capacitor is made from a carbon material, and coated with human-like proteins that act as electrodes (电极). But what makes the device different is that it is powered by an energy harvester that changes body heat and movement in the blood into energy.

    Those traditional pacemakers are six to eight millimeters(毫米) thick. They are much bigger. The new super capacitor, which, due to its lack of battery, is only one micrometer(微米) thick. This "little" feature could benefit the new pacemaker's energy efficiency, researchers stated. Also, unlike other batteries used in medical treatments, the super capacitor can bend and twist in the body without suffering damage.

    Though they've not been widely used in the medical world, super capacitors have the ability to serve as a safer and more efficient medical device than the traditional battery-operated devices, the researchers believe.

    "In order to be effective, battery free pacemakers must have super capacitors that can get, store and transport energy. However, commercial super capacitors are too slow to make them work", said Maher El-Kady, a UCLA researcher and co-author of the study. “Our research focused on the custom-designed super capacitor to capture energy effectively, and finding a way to make it exist together successfully with the human body."