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.
Chinese refers to a family of languages, the most important of which is Mandarin and perhaps the second most important of which is Cantonese. Simplified Chinese refers to a simplified form of writing Mandarin Chinese used mainly in mainland China.