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HAIKOU, Jan. 28 (Xinhua) -- China's aviation authorities on Friday started to allow helicopters to fly in low-altitude airspace over the tourist island of Hainan on a trial basis for the first time. The aim is to eventually open a part of the country's tightly-controlled airspace to private aircraft.Four helicopters were manned by eight pilots from Shanghai-based Zhengyang Investment Group, a leading domestic firm in the general aviation industry. They are expected to conduct test flights in the sky, 1,000 meters above the ground in Hainan in the next two months.The flight test will collect data for low-altitude flying and test the ground control system's response to emergencies, said Zou Jianming, chairman of Zhengyang Investment Group.Hainan is the first place in China to conduct test flights of private aircraft in low-altitude airspace, said Jiang Sixian, deputy governor of the province. Domestic and foreign firms are both welcome to invest in Hainan's general aviation sector to develop world-class tourism here.China's low-altitude airspace is controlled by the Air Force and the Civil Aviation Administration of China (CAAC). Every private aircraft flight needs approval, and the procedure can take from one day up to a week.But last November, the State Council and the Central Military Commission said that part of the low-altitude airspace would be opened to promote the country's general aviation sector, including the purchase and use of private planes.General aviation refers to the part of the aviation industry that excludes flights for military, law enforcement and public transport. China has only 900 aircraft, 80 airports and fewer than 10,000 pilots in the general aviation segment.The market for general aviation in China is valued at only 13 billion yuan (1.98 billion U.S. dollars) but is expected to grow by 15 percent annually until 2020, Hainan aviation officials said.

SAN FRANCISCO, May 3 (Xinhua) -- Apple Inc. announced on Tuesday that it has updated its iMac all-in-one desktop, adding Intel's next generation quad-core processors, Thunderbolt data ports and a new HD camera.Starting at 1,199 U.S. dollars, the new iMac is up to 70 percent faster and its new graphics deliver up to three times the performance of the previous generation, Apple said in a statement.The new iMac features quad-core Intel Core i5 processors with an upgrade option to Core i7 processors.The 21.5-inch model has a single Thunderbolt port while the 27- inch has two, in addition to four USB 2.0 inputs and a FireWire 800 port.Thunderbolt, which debuted with Apple's updated MacBook Pro notebooks in February, is also an Intel design bringing together high-speed data transfer and high-definition display onto a single cable. It can transfer a full-length HD movie in less than 30 seconds with a speed of 10 gigabits per second, which is twice the speed of USB 3.0, 12 times faster than FireWire 800 and up to 20 times faster than USB 2.0.The new iMac also includes a built-in FaceTime HD camera, which supports high-definition video calls, Apple said.

BEIJING, March 18 (Xinhuanet) --In February this year, Chinese National Geographic magazine published a series of exquisite pictures about Shicheng City (literally, Lion City), and since then, the public's strong interest in the city has been aroused again.The city of nearly 1,339 years of age, situated in east China's Zhejiang Province, has been submerged under Qiandao Lake since 1959 for the construction of the Xin'an River Hydropower Station.International archeologists vividly named the city submerged in water "time capsule." Since it is shielded from the erosion by wind, rain and sun, a city submerged in water comparatively maintains a stable condition, thus making the city a virtual time vessel. Seen from the pictures of Shicheng City, stairs in ancient houses, walls and memorial arches remain the same as they were thousands of years ago.Shicheng City was named after the Wu Shi Mountain (literally, Five Lion Mountain) in the northern part of Sui'an County, Zhejiang. It was once the center of politics, economics and culture of Sui'an County in that area.As written in the "History of Sui'an County," there are all together 265 arches submerged under Qiandao Lake, among which the Jie Xiao Memorial Arch's fine carvings remain well-preserved.According to the restored map of Shicheng, there were five city gates in all directions. You can find one city gate tower on each city gate and all together there are five towers. Besides, six streets in Shicheng City were used to connect every corner of the city as a whole. The typical roads in Shicheng City were stone roads, tidily paved by flagstone and pebbles.

UNITED NATIONS, April 7 (Xinhua) -- To celebrate the 50th anniversary of the first human space flight, accomplished on April 12, 1961 by Soviet cosmonaut Yuri Gagarin, the Russian Permanent Mission to the United Nations, the Russian Federal Space Agency and the ITAR-TASS information agency organized an exhibition which was opened here on Thursday."The first human space flight is not one of the most significant events of the past century, but of human history in general," Vitaly Churkin, the Russian permanent representative to the UN, said at the opening ceremony."It's a symbol of courage, thirst for knowledge, and progress," Churkin said.The exhibition contained archival photos telling the story of the first human space flight and of those who made it possible, and historic pictures of Gagarin.As part of the celebration of human space flight's 50th anniversary the UN Postal Administration designed postal stamps which will be issued on April 12, to tell the story of progress that humankind has made beyond earth's boundaries, as Kiyo Akasaka, Under-Secretary-General for Communications and Public Information put it."Fifty years have passed since that amazing voyage, but the legend of Gagarin's courage and journey to the 'final frontier' continues to be a source of inspiration for space exploration for peoples and nations around the world," Akasaka said at the opening of the exhibition.According to Akasaka, the exhibition "sparks people's imagination about what is possible through the peaceful use and exploration of outer space."Other attendees included Russian cosmonaut Oleg Kotov.Gagarin, also known as the Columbus of the Cosmos, traveled into outer space on the height of the Cold War when the Berlin Wall was built, at a moment when it was hardly impossible to imagine that more than 15 nations would work together in humanity' s permanent space outpost -- the International Space Station.The Russian icon of space spoke the historic words "the earth is blue, how wonderful. It is amazing."On Thursday the UN General Assembly adopted a resolution declaring April 12 as the International Day of Human Space Flight.

来源：资阳报