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.
The Kangxi Dictionary (Chinese: åº·çå­å¸; pinyin: KÄngxÄ« ZÃ¬diÇn) was the standard Chinese dictionary during the 18th and 19th centuries. The Kangxi Emperor of the Manchu Qing Dynasty ordered its compilation in 1710. It used the earlier Zihui system of 214 radicals, today known as 214 Kangxi radicals, and was published in 1716. The dictionary is named after the Emperor's era name.