在历史进入现代以来,人类掌握了机器技术和互联网等工具后,驾驭自然的力量巨增而获得突变。积蓄千年甚至万年的生产生活方式迅即消失,建立在不同生产方式和生活方式之上的各个族群的独特文化也多数到了濒临灭绝的状态。许多我们在三四十年前还能见到的一些文化细节现在已经再无踪影,只是成为这一代还活着的人的一些心理记忆。但这种记忆是非常脆弱的,不能够承担历史文献的作用。它不是历史工作者在调查中记录的文本,是从印象出发的追忆,没有在调查记录现场的那些实证 Since the history has entered the modern era, human beings have mastered the technology of machines and the Internet and have taken a sudden and dramatic change in the power of controlling nature. The production and lifestyles that have accumulated thousands of years or even ten thousand years disappear immediately. Most of the unique cultures of all ethnic groups based on different modes of production and life styles are also on the verge of extinction. Many of the cultural details that we saw before thirty or forty years ago are now gone, only to become some of the psychological memories of the still alive people of this generation. However, this kind of memory is very fragile and can not afford the role of historical documents. It is not a text that historians record in surveys, a reminder of impressions, an absence of evidence in the field of investigation records