US President Barack Obama visited the Badaling section of the Great Wall in Beijing on Nov. 18th, 2009. The Great Wall was the second sightseeing program for Obama during his visit to China.

    Built originally as the biggest defense work in ancient China, the Great Wall today has become one of the must-see places for visiting foreign leaders to the country in the past sixty years.

    “ I'm inspired by the majesty(雄伟壮观) of the Great Wall and grateful for the warmth of the Chinese people,” Obama said after his half-hour tour.

    “It's magical,” Obama said when walking along the Great Wall, “it reminds you of the sweep of history and our time here on earth is not that long. We better make the best of it.”

    “I brought back the admiration(钦佩) for the Chinese civilization(文明), I bring here the greetings of American people.” Obama said when climbing a watchtower to enjoy a distant view at the Badaling section of the Great Wall.

    Obama is the fifth US president to visit the Great Wall. Richard Nixon visited the Great Wall in 1972, Ronald Reagan in 1984 and Bill Clinton in 1998, In 2002, former US President George W. Bush and his wife Laura toured the same sections Obama did.

    A ground-based system that uses much stronger signals than GPS can find your location in cities and indoors. It is a new positioning system that could compete with GPS to make sure you never lose your directions again.

    Instead of satellites, Locata uses ground-based equipment to send a radio signal over a localized area that is a million times stronger on arrival than GPS. It can work indoors as well as outdoors, and the makers claim that the receivers can be shrunk(缩小) to fit inside a regular cell phone. Even the US armies, which invented GPS technology, signed a file last month agreeing to a test of Locata at the White Sands Missile Range in New Mexico.

    “This is one of the most important technology developments for the future of the positioning industry,” says Nunzio Gambale, CEO and co-founder of the firm Locata, based in Griffith, Australia.

    As for the Locata's correctness, Christopher Morin of the US Air Force tested it recently at White Sands, and it worked to within 18cm along any axis(轴). Morin said it should be possible to get the exactitude down to 5cm.

    The tests were performed in an open desert where GPS also worked beautifully, but its signal was weak—like a car headlight from 20,000 kilometers away—and easily cut off by solid objects(实心的物体). Locata's signal was far stronger, though not guaranteed to work in a complex urban environment, said David, speaker of the UK' s General Lighthouse Authorities.

    Locata's technology will face competition in the race to transform indoor navigation. But it could shine in specific areas, Gambale said. Robots with Locata could easily navigate inside buildings without the complex optical(视觉的) systems they need at the moment. And the process that handles correct location data could not only guide you around a mall, railway station or airport, but also take you to the exact shelf in a shop for the product you want. It would be small and cheap enough for smart phones and it should be available within five years—a similar path to the one GPS took on its way towards the world, he said.

    The Allendale Cultural Center has expanded its arts program to include classes for young adults. Director Leah Martin announced Monday that beginning in September, three new classes will be offered to the Allendale community. The course titles will be Yoga(瑜伽) for Teenagers; Hip Hop Dance: Learning the Latest Moves; and Creative Journaling for Teens: Discovering the Writer Within. The latter course will not be held at the Allendale Cultural Center but instead will meet at the Allendale Public Library.

    Staff member Tricia Cousins will teach the yoga and hip hop classes. Ms. Cousins is a skilled choreographer(舞蹈指导) as well as an experienced dance educator. She is a Master of Arts in dance education from Teachers College, Columbia University. The journaling class will be taught by Betsy Milford. Ms. Milford is the head librarian at the Allendale Public Library as well as a columnist(专栏作家) for the professional journal Library Focus.

    The courses are part of the Allendale Cultural Center's Project Teen, which was organized by Leah Martin, Director of the Cultural Center. According to Martin, this project is a direct result of her efforts to make the center a more necessary part of the Allendale community. Over the last several years, the number of people who have visited the cultural center for classes or events has steadily declined. Project Teen is primarily funded by the McGee Arts Foundation, an organization devoted to bringing arts programs to young adults. The other members of Project Teen are two students at Allendale's Brookdale High School and three adults with backgrounds in education and the arts.

    The creative journaling class will be cosponsored by Brookdale High School, and students who complete the class will be given the opportunity to publish one of their journal works in Pulse, Brookdale's student literary magazine. Students who complete the hip hop class will be qualified to participate in the Allendale Review, an annual concert sponsored by the cultural center that features local actors, musicians, and dancers.

    All classes are scheduled to begin immediately after school, and transportation will be available from Brookdale High School to the Allendale Cultural Center and the Allendale Public Library. For more information about Project Teen, contact the cultural center's programming office at 988­0099 or drop by the office after June 1 to pick up a fall course catalog. The office is located on the third floor of the Allendale Town Hall.

    With spring officially here, we can look forward to fresh flowers and cherry blossoms. While you could stay home and admire the change in season, why not celebrate the end of winter with a fun spring time holiday？We've found a handful of terrific packages at home and abroad, good for departures through mid-May.

       London's Chelsea Flower Show for $849

    Every May, London hosts the world famous Chelsea Flower Show, showcasing astonishing gardens, and lively horticultural(园艺) displays that set the latest in garden design trends. This year, Virgin Vacations offers a six night air-land packages priced at a sweet $849.Good for departures May 21—23, this deal covers the following costs: accommodations; airfare from New York; daily continental breakfast; and one full day entrance to the Flower Show (May 24, 25 or 26).

    Cherry Blossoms in Washington D. C. from $319/nt.

    You don't need to travel far for an impressive flower show！From March 31 through April 15 Washington D. C.is hosting its yearly Cherry Blossoms Festival, marking the 95th celebration of the original gift of 3,000 cherry trees from the city of Tokyo to the people of D. C.. Several hotels are honoring the occasion with special deals：for example, Hay-­Adams offers a Cherry Blossom Package from $319/night with lodging (two-night minimum stay), free parking, and a special amenity.

    Spring Flowers of Amsterdam for $739

    Want to catch the spring flowers blooming in the lowlands of Holland？Amsterdam is a treat to visit at this time of year, as its numerous gardens explode with color. You can go Dutch and save some serious dollars to boot！At just $739 for a four night stay with airfare, at this spring escape is priced to go！Good for travel between April 1 and May 17, the deal includes air from New York; accommodation at a budget hotel; daily breakfast; and a local map and guide.

    Tokyo Spring Fun for $949

    To spot the cherry blossoms right at the source, we recommend a spring venture to Tokyo. Now you can visit on the cheap with the Asian Affair Holidays special we found：a Tokyo spring special starts at just $949！This deal covers airport transfers; five nights' lodging at Tokyo Hilton International; and a half day city tour. This particular price is valid for departures between April 1 and April 30, perfectly timed for the best of cherry­ blossom season.

    Hiking England

    DAY 1: ST. BEES TO ENNERDALE BRIDGE

    Our journey sets out early this morning with a Coast to Coast tradition approaching the Irish Sea. Then set off along the rocks of St. Bees Head. Turning inland, we'll pause for a typical pub lunch on our way to Ennerdale Bridge, located at the foot of the Lake District mountains. (15 miles hiking, 8 hours)

    Accommodations: Ennerdale Country House Hotel

    DAY2: ENNERDALE BRIDGE TO HONISTER

    Today we'll walk into impressive Lake District National Park, where glass-like lakes reflect mountains that rise from their shores. Our pleasant walk covers the southern edge of Ennerdale Water, the park's most western lake. After lunch near the Black Sail Hut, climb a 2,000 foot mountain and take in the beautiful views of lakes and pastures (牧场). We finish in Borrowdale, a short transfer (转乘) from our hotel. (13 miles hiking, 9 hours)

    Accommodations: Inn on the Lake

    DAY 3: GRASMERE TO GLENRIDDLNG

    Take a short drive to Grasmere, where the great poet William Wordsworth wrote some of his most well-known works. Visit the poet's home, and walk through the village where he found inspiration. Then climb over Grisedale Hause enjoying views of Helvellyn, England's third-highest mountaintop. Hike down the valley toward Lake Ullswater and spend the night in Glenridding. (9 miles hiking, 5 hours)

    Accommodations: Glenridding Lake Hotel

    DAY 4: LAKE ULLSWATER TO SHAP

    The day begins with a scenic journey on Lake Ullswater to Howtown. From here, we cross a historic Roman road on our way to Bampton. Hike to the 12th-century Shap Abbey. A short transfer takes us to our hotel in the typical English village of Ravenstonedale. (12 miles hiking, 7 hours)

    Accommodations: The Black Swan

    OPENINGS AND PREVIEWS

    Antlia Pneumatica

    In a new play by Anne Washburn, directed by Ken Rus Schmoll, a group of estranged friends gather at a Texas farm house to bury one of their peers. (Peter Jay Sharp, 416 W. 42nd St. 212-279-4200. In previews.)

    Bright Star

    Steve Martin and Edie Brickell wrote this bluegrass-and-Americana musical, in which a magazine editor meets a soldier returning from the Second World War. Walter Bobbie directs. (Cort, 138 W. 48th St. 212-239-6200. In previews.)

    The Crucible

    Ivo van Hove directs Arthur Miller's classic drama about the Salem witch trials, starring Saoirse Ronan, Ben Whishaw, Ciaran Hinds, and Sophie Okonedo. (Walter Kerr, 219 W. 48th St. 212-239-6200. In previews.)

    Dry Powder

    John Krasinski, Claire Danes, and Hank Azaria star in Sarah Burgess's play, in which an executive at a private-equity firm (私人股本公司) tries to rebound from a P.R. disaster. Thomas Kail directs. (Public, 425 Lafayette St. 212-967-7555. In previews. Opens Oct. 28, 2017)

    The Father

    Frank Langella stars in a play by the French writer Florian Zeller, translated by Christopher Hampton and directed by Doug Hughes for Manhattan Theatre Club, about an eighty-year-old man who is losing his grip on his own life story. (Samuel J. Friedman, 261 W. 47th St. 212-239-6200. Previews begin Oct. 28, 2017)