1 Down syndrome, usually is caused by an extra copy of chromosome 21 (trisomy 21). Characteristics include decreased muscle tone, asymmetrical skull, slanting eyes and mild to moderate mental retardation.  Edward's syndrome, which is the second most common trisomy after Down syndrome. It is a trisomy of chromosome 18.
Guanxi describes the basic dynamic in personalized networks of influence, and is a central idea in Chinese society.
Shijiazhuang is a young city. It was an unimportant town until the building of the Zhengtai and Jinghan railways saw it become an important regional transport hub. Captured by the PLA under the leadership of the CPC in 1947, it was the cradle of the new China, and for three years housed the headquarters of the CPC.hijiazhuang is the largest pharmarceutical base in China and is as well an important center in the textile, IT, manufacturing and chemical industries. In 2007, it was listed as one of the top 15 economic powers in China.