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Sino-Tibetan languages
The Sino-Tibetan languages are a family of more than 400 languages spoken in East Asia, Southeast Asia and parts of South Asia. The family is second only to the Indo-European languages in terms of the number of native speakers. The Sino-Tibetan languages with the most native speakers are the varieties of Chinese (1.2 billion speakers), Burmese (33 million) and the Tibetic languages (8 million). Many Sino-Tibetan languages are spoken by small communities in remote mountain areas and are poorly documented.
Several low-level groupings are well established, but the higher-level structure of the family remains unclear. Although the family is often presented as divided into Sinitic and Tibeto-Burman branches, a common origin of the non-Sinitic languages has never been demonstrated, and is rejected by an increasing number of researchers. A minority of researchers call the whole family "Tibeto-Burman", and the name "Trans-Himalayan" has also been proposed.
==History==
A genetic relationship between Chinese, Tibetan, Burmese and other languages was first proposed in the early 19th century, and is now broadly accepted. The initial focus on languages of civilizations with long literary traditions has been broadened to include less widely spoken languages, some of which have only recently, or never, been written. However, the reconstruction of the family is much less developed than for families such as Indo-European or Austroasiatic. Difficulties have included the great diversity of the languages, the lack of inflection in many of them, and the effects of language contact. In addition, many of the smaller languages are spoken in mountainous areas that are difficult to access, and are often also sensitive border zones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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