When a leafy plant is under attack ，it doesn't sit quietly. Back in 1983, two scientists, Jack Schultz and Ian Baldwin,reported that young maple trees getting bitten by insects send out a particular smell that neighboring plants can get. These chemicals come from the injured parts of the plant and seem to be an alarm.What the plants pump through the air is a mixture of chemicals known as volatile organic compounds,VOCs for short.

Scientists have found that all kinds of plants give out VOCs when being attacked .It's a plant's way of crying out.But is anyone listening?Apparently.Because we can watch the neighbours react.

    Some plants pump out smelly chemicals to keep insects away.But others do double duty .They pump out perfumes designed to attract different insects who are natural enemies to the attackers. Once they arrive, the tables are turned. The attacker who was lunching now becomes lunch.

    In study after study,it appears that these chemical conversations help the neighbors .The damage is usually more serious on the first plant,but the neighbors ,relatively speaking ,stay safer because they heard the alarm and knew what to do.

Does this mean that plants talk to each other? Scientists don't know. Maybe the first plant just made a cry of pain or was sending a message to its own branches, and so, in effect, was talking to itself. Perhaps the neighbors just happened to “overhear” the cry. So information was exchanged, but it wasn't a true, intentional back and forth.

    Charles Darwin, over 150 years ago, imagined a world far busier, noisier and more intimate(亲密的) than the world we can see and hear. Our senses are weak. There's a whole lot going on.

    During the cold winter days, there are some interesting festivals in the world. Look at the following ones.

Harbin Ice and Snow Festival

Place: China

Time: January 5 to February 5

People build incredible things out of ice and snow, decorating them with lights.

The Carnival of Venice

Place: Italy

Time: between February and March

One of the most beautiful festivals in the world, people wear masks and elaborate costumes to hide differences among classes, and there an, contests for the best costumes.

Holi Festival

Place: India

Time: late February/March, on, the last full moon day and Sikhs, in India, Nepal, and Sri Lanka celebrate the main day of this incredibly fun 16 -day festival by throwing colored powder and water at each other.

Sundance Film Festival

Place: Utah, the US

Time: end of February

The largest independent film festival in the US. Watch both feature films and shorts. You need to buy a ticket.

    Maui, one of the most beautiful islands in the world, is a dream place for a visit and there are so many attractions for you.

    HALEAKALA

    Mt. Haleakala is 10,023 feet high and is one of the two volcanoes that created this incredible Hawaiian island. Haleakala National Park offers a variety of activities, making it one of the most revisited attractions in all the Hawaiian Islands. The most popular activities include enjoying sunrise and sunset, hiking, and backcountry camping on Maui.

    ROAD TO HANA

    There are many ways to experience the Road to Hana, and the sleepy coastal Town of Hana, Maui. Visitors can go by group and private tours, or explore on their own by renting a vehicle. Beginning at the historic Town of Paia, visitors can enjoy decorated coastlines all the way to Hana, world-famous beaches in Hawaii, tropical landscapes, waterfal.ls, scenic lookout points, and cultural attractions that mark significant points in Maui's unique Hawaiian history.

    HO'OKIPA BEACH PARK

    Ho'okipa Beach Park is one of the most famous beaches in the world for professional surfing and windsurfing. In the ancient Hawaiian language, “ho'okipa” means hospitality, which is exactly what this Beach Park offers! At Ho'okipa, visitors can see the powerful coastline from the top parking lot for amazing photo opportunities. Or you can go to the sand for afternoon BBQ's and the glorious Maui sunshine.

    OHE'O GULCH POOLS

    The Ohe'o Gulch Pools, more commonly referred to as the Seven Sacred Pools, is a wonderful place to explore Maui on vacation. The lower pools are more easily accessed, and perhaps the best choice for visitors who want to jump in. Due to the popularity of the Seven Sacred Pools, it is highly suggested to arrive early for a chance to enjoy privacy in this beautiful location.

    Thomas Edison received a patent(专利) for his kinetoscope(电影放映机) on August31, 1887. It was a machine for viewing moving pictures. Edison had hoped to combine his no invention with the phonograph(留声机), which he had invented 10 years earlier. He thought that people would like to watch moving pictures that went along with the sound. He was not able to make them work together. The kinetoscope, however, was a popular attraction by itself. A person looked through small holes in a box-like machine and saw pictures in action. One of the first films made showed a man sneezing.

    A problem with this invention was that only one person could view the moving pictures at a time. By 1891, Edison had invented a projector that showed the film on a screen. Many people could watch together.

    In 1893, Edison built a motion-picture studio. He made over 300 silent films. Most of them were short. That was because the pictures flashed, or shook a lot. It was hard for people to watch more than 10 minutes at a time.

    The first films were mostly of real events. They would show famous people walking somewhere, cars on a street, burning houses, and other news stories. Then comedies and short dramas were made.

    Edison's movie studio closed in 1918. By then other companies were also making films. Better cameras were made. Sound was added. Then color came along. Today, movies are among the most popular forms of entertainment.

    Good afternoon, and welcome to England. We hope that your visit here will be a pleasant one. Today, I would like to draw your attention to a few of our laws.

    The first one is about drinking. Now, you may not buy alcohol (酒) in this country if you are under 18 years of age, nor may your friends buy it for you.

    Secondly, noise. Enjoy yourselves by all means, but please don't make unnecessary noise, particularly at night. We ask you to respect other people who may wish to be quiet.

    Thirdly, crossing the road. Be careful！The traffic moves on the left side of the road in this country. Use pedestrian crossings (人行横道) and do not take any chances when crossing the road.

    My next point is about litter (throwing away waste material in a public place)．It is an offence (违法行为) to drop litter in the street. When you have something to throw away, please put it in your pocket and take it home, or put it in a litter bin.

    Finally, as regards something, it is against the law to buy cigarettes or tobacco (烟草) if you are under 16 years of age.

    I'd like to finish by saying that if you require any sort of help or assistance, you should contact your local police station, who will be pleased to help you.

    Now, are there any questions?

    I've come back to check on a baby. Just after dusk I'm in a car down a muddy road in the rain, past rows of shackled (戴镣的) elephants, their trunks swinging. I was here five hours before, when the sun was high and hot and tourists were on elephants' backs.

    Walking now, I can hardly see the path with my phone's flashlight. When the wooden fence post stops me short, I point my light down and follow a current of rainwater across the floor until it washes up against three large, gray feet. A fourth foot twisted above the surface, tied tightly by a short chain and choked by ring of metal spikes (尖刺). When the elephant gets tired and puts her foot down, the spikes press deeper into her ankle.

    Meena is four years and two months old, still a child as elephants go. Khammon Kongkhaw, her caretaker, told me earlier that Meena wears the spiked chain because she tends to kick. Kongkhaw has been responsible for Meena here at Maetaman Elephant Adventure, near Chiang Mai, in northern Thailand, since she was 11 months old. He said he keeps her on the spiked chain only during the day and takes it off at night. But it's night now.

    I ask Jin Laoshen, the Maetaman worker, why her chain is still on. He says he doesn't know.

    Maetaman is one of many animal attractions in and around tourist-crowded Chiang Mai. Meena's life is set to follow the same track as many of the roughly 3,800 captive (被捕获的) elephants in Thailand. When Meena is too old or sick to give rides—maybe at 55, maybe at 75, she'll die. If she's lucky, she'll get a few years of retirement. She'll spend most of her life on a chain.