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BEIJING, Oct. 2 (Xinhua) -- Chinese archeologists have found evidence indicating that the mysterious ancient city of Loulan (Kroraina) once had highly-developed agricultural systems.Scientists from the Institute of Geology and Geophysics under the Chinese Academy of Sciences conducted remote sensing procedures, field investigations and sample testing in the area and found that there were once large tracts of farmlands in Loulan.The farmland featured regular and straight circumferences stretching for 200 to 1,000 meters as well as irrigation ditches running throughout, said Qin Xiaoguang, a member of the research team.Moreover, researchers found grain particles in the area's ground surface, which are very likely to be remains of crop plants, Qin said.These findings show that irrigation farming had been practiced in Loulan for at least 100 years, Qin said.Qin said they also found canal remains measuring 10 to 20 meters wide and 1.6 meters deep in the Loulan relics, indicating that the city, which is suspected of perishing in drought, was once rich in water resources.The ancient city was a pivotal stop along the famous Silk Road, but mysteriously disappeared around the third century AD.Previous historical records suggested that Loulan's economy was sustained by widespread agricultural activity, but no remains or other evidence had been found before the most recent discoveries.

SAN FRANCISCO, Oct. 17 (Xinhua) -- Apple on Monday announced that it has sold more than four million of its new iPhone 4S, three days after the launch last Friday."IPhone 4S is off to a great start with more than four million sold in its first weekend--the most ever for a phone and more than double the iPhone 4 launch during its first three days," said Philip Schiller, Apple's senior vice president of worldwide product marketing.In addition, more than 25 million customers are already using iOS 5, the latest version of the mobile operating system powering Apple's mobile devices, since it was released last Wednesday; and more than 20 million customers have signed up for iCloud, the cloud service designed to store and sync data for download to multiple devices, said the company in the statement.The iPhone 4S, which looks the same as the iPhone 4, has major hardware upgrade inside, including a faster chip, a higher- resolution camera and Siri intelligent voice control.Last Friday, AT&T and Sprint, two iPhone wireless carriers in the United States, said they have seen record daily sales with the launch of the iPhone 4S.The lasted Apple smartphone is currently on sale in the U.S., Canada, France, Germany, Japan and Britain, and will be available in 22 more countries on Oct. 28. Apple said the phone will be on sale in more than 70 countries and regions by the end of this year.

BEIJING, Oct. 18 (Xinhuanet) -- Some seaweeds can kill the reef-building corals around them by emitting anti-coral chemicals, a new study found.The study was published Monday in the online edition of the journal Proceedings of the U.S. National Academy of Sciences (PNAS).The researchers investigated the interactions between eight different species of seaweed and three species of coral growing in the waters nearby the Fiji Islands, and identified a class of anti-coral organic compounds known as terpenes.These chemicals, found on the surfaces of several species of seaweed, can kill the coral by suppressing its photosynthesis.The finding suggests that the living space competition with seaweeds could be a factor of the coral's worldwide decline.Plant-eating fish normally controls seaweed growth on coral reefs, but the populations of these consumers are declining by the overfishing, which eventually resulted in the seaweed's dominant position, according to the researchers.Despite overfishing, pollution and warming oceans are also the contributors to coral's worldwide decline, said Jennifer Smith, a marine ecologist at the University of California, San Diego.

PARIS, Oct. 15 (Xinhua) -- Faced with new problems such as sovereign debt and downward risks, all countries should work together to enhance coordination on macroeconomic policies to guard economic growth and financial stability with respective effort, Chinese delegates said Saturday here at the G20 Financial Ministers Meeting.The global economy is challenged by new difficulties which require all countries to join hands in fighting all sorts of protectionism either in trade or in investment, according to a statement issued by the Chinese delegation led by Chinese Financial Minister Xie Xuren and Central Bank Governor Zhou Xiaochuan.China suggested that leading developed countries should ensure economic recovery and financial stability in short term, while in the medium term enhance fiscal solidarity, accelerate structural reform and refrain the negative impact of macroeconomic policies.Meanwhile, China also stressed that the emerging countries should make their own contribution to tackle the problems. "The emerging markets should promptly take flexible and effective macroeconomic measures in order to control slowdown and tackle with impacts from inflation and capital flows," the statement said.Emerging economies "should also quicken their pace on structural reform in a bid to realize stable and faster growth," the statement added.During the two-day meeting, G20 financial leaders gathering in Paris welcomed the progress the Europe made on the eurozone debt issue on Saturday, but meanwhile expected the euro area to rely more on itself with bigger bailout fund to avoid contagion.

来源：资阳报