change and extinction of language 语言的变化与消亡
The Thesis comprises six chapters:Chapter One illustrates the language extinction in the world and explains the causes for language extinction.
全文分为六章：第一章：语言保护的严峻性及导致语言消亡的原因。
参考来源 - 藏语维护：对巴塘县藏语使用情况的调查研究·2,447,543篇论文数据，部分数据来源于NoteExpress
No doubt, language extinction is irreplaceable loss for human civilization.
但不可否认的是，语言的消亡是人类文化不可弥补的损失。
Because India has many large and proud language communities, and many more small ones that face extinction.
因为印度有很多庞大且骄傲的语言群落，还有更多的面临灭绝的较小的语言。
Our Lakota language is an Endangered language, on the verge of extinction.
我们拉科塔族的语言已经在消亡的边缘。
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