The Yellow River has always been known for"easily silting up,easily bursting its banks,and easily shifting course"and its course has indeed changed many times.It did not undergo any large-scale course change...The Yellow River has always been known for"easily silting up,easily bursting its banks,and easily shifting course"and its course has indeed changed many times.It did not undergo any large-scale course changes during the pre-Qin period,but instead followed the course given in the"Hanzhi汉志(Treatises in the Book of Han)."The river recorded in the Yugong禹贡(Tribute of Yu)is actually the Hanzhi river,and the he(river)recorded in the Yugong that passed through the counties of Xunxian and Neihuang actually followed the former course of the Qi River.The Yellow River’s large-scale course changes began in the Han dynasty.After two thousand years of frequent changes,a 6-15 meters thick layer of sediment formed in the lower reaches of the Yellow River,completely altering the natural landscape of hills,rivers and lakes that had existed in the pre-Qin lower Yellow River,and finally shaping today’s landscape of an endless plain.The course changes brought about a rupture in the development of civilization in this area,with most cities and towns destroyed.The changes in the ecological and living environment around the lower Yellow River over thousands of years were apparently related to the flooding and course changes of the Yellow River,but in reality were caused by human over-exploitation of natural resources.展开更多
Benefited from the speedy development of omic tools and the use of model plants, such as rice, Arabidopsis and Medicargo, plant biologists have recently made tremendous breakthroughs in understanding plant growth, dev...Benefited from the speedy development of omic tools and the use of model plants, such as rice, Arabidopsis and Medicargo, plant biologists have recently made tremendous breakthroughs in understanding plant growth, development, and response to environmental changes. Many fundamental questions, such as flower initiation, light signal transduction, intercellular communication, genomic composition and epigenetic regulation, etc,, have been resolved during the past two decades, Several dedicated plant science journals, such as The Plant Cell, The Plant Journal and Plant ＆ Cell Biology contributed to this progress through the publication of seminal articles that allowed scientists in the community to communicate with each other, to share their expertise and experimental materials.展开更多
Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following ...Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following year.The year 2008 is the year of real"turning point",on September 15th,the century-old Lehman Brothers on Wall Street closed down surprisingly and detonated the on-going financial crisis,the world then entered a展开更多
The year 2017 is the first year for the U.S.Trump Administration,is the election year to determine the fate of many European countries,is the year for changing situation in the Middle East,and is the year for the Chin...The year 2017 is the first year for the U.S.Trump Administration,is the election year to determine the fate of many European countries,is the year for changing situation in the Middle East,and is the year for the Chinese diplomacy to open a new chapter.What are the展开更多
The Chinese economy switches gears as it shifts from an export-oriented to a consumption-driven growth pattern The Chinese economy grew a robust 9.6 percent in the third quarter of this year,maintaining its sound mome...The Chinese economy switches gears as it shifts from an export-oriented to a consumption-driven growth pattern The Chinese economy grew a robust 9.6 percent in the third quarter of this year,maintaining its sound momentum even though the quarterly growth rate was 0.7 percentage points less than that of the second quarter,the National Bureau of Statistics(NBS) announced展开更多
文摘The Yellow River has always been known for"easily silting up,easily bursting its banks,and easily shifting course"and its course has indeed changed many times.It did not undergo any large-scale course changes during the pre-Qin period,but instead followed the course given in the"Hanzhi汉志(Treatises in the Book of Han)."The river recorded in the Yugong禹贡(Tribute of Yu)is actually the Hanzhi river,and the he(river)recorded in the Yugong that passed through the counties of Xunxian and Neihuang actually followed the former course of the Qi River.The Yellow River’s large-scale course changes began in the Han dynasty.After two thousand years of frequent changes,a 6-15 meters thick layer of sediment formed in the lower reaches of the Yellow River,completely altering the natural landscape of hills,rivers and lakes that had existed in the pre-Qin lower Yellow River,and finally shaping today’s landscape of an endless plain.The course changes brought about a rupture in the development of civilization in this area,with most cities and towns destroyed.The changes in the ecological and living environment around the lower Yellow River over thousands of years were apparently related to the flooding and course changes of the Yellow River,but in reality were caused by human over-exploitation of natural resources.
文摘Benefited from the speedy development of omic tools and the use of model plants, such as rice, Arabidopsis and Medicargo, plant biologists have recently made tremendous breakthroughs in understanding plant growth, development, and response to environmental changes. Many fundamental questions, such as flower initiation, light signal transduction, intercellular communication, genomic composition and epigenetic regulation, etc,, have been resolved during the past two decades, Several dedicated plant science journals, such as The Plant Cell, The Plant Journal and Plant ＆ Cell Biology contributed to this progress through the publication of seminal articles that allowed scientists in the community to communicate with each other, to share their expertise and experimental materials.
文摘Looking back at the developments in the past five years(2007-2012),the first is fermentation of the U.S.subprime mortgage crisis in 2007,which fused the outbreak of the international financial crisis in the following year.The year 2008 is the year of real"turning point",on September 15th,the century-old Lehman Brothers on Wall Street closed down surprisingly and detonated the on-going financial crisis,the world then entered a
文摘The year 2017 is the first year for the U.S.Trump Administration,is the election year to determine the fate of many European countries,is the year for changing situation in the Middle East,and is the year for the Chinese diplomacy to open a new chapter.What are the
文摘The Chinese economy switches gears as it shifts from an export-oriented to a consumption-driven growth pattern The Chinese economy grew a robust 9.6 percent in the third quarter of this year,maintaining its sound momentum even though the quarterly growth rate was 0.7 percentage points less than that of the second quarter,the National Bureau of Statistics(NBS) announced
