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The study said: "While the breakdown of Angkor's hydraulic network, most likely associated with climate variability in the mid-14th and early 15th centuries, represents the end of Angkor as a viable settlement, our data indicate that it was presaged by a protracted demographic decline.

The survey showed that excessive schoolwork and pressure from cram schools are deemed to be the two major causes of the lack of sleep, accounting for 61.1 percent and 54.5 percent, respectively.

The study also found that Chinese firms contribute to training as much as other firms, especially in the manufacturing sector.

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The team recently published its study.

The survey by the Confederation of Indian Industry and Evalueserve, a professional services firm, found that Indian companies in China are neither daunted nor affected by talk of slowing economic growth and uncertainty caused by Sino-US trade tensions.

The study was released on the same day.

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The supervisory system should be improved for tutoring services, Xiong said. All such services should be governed by a national supervisory system, allowing no "grey areas", while a joint mechanism should be established to avoid overlapping responsibilities, he said. All tutoring institutions must submit their files in the system and should deposit risk-managing funds, he said.

The students got to know cherry grower Yan Chuanhong, from the rural area of Lushunkou district, when doing volunteer work.

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The symbolic 100-day mark for the administration is Saturday — the same day government could shut down without a budget deal. Trump has announced a rally in Pennsylvania that day.

The study found that the hormone called E1G was linked with more awakenings, and another hormone called PDG was linked with a trend toward higher sleep fragmentation index.