XDF-23

ypngzhang

PASSAGE 23
* At the end of the nineteenth century, a rising interest in Native American customs and an increasing desire to understand Native American culture prompted ethnolo- gists to begin recording the life stories of Native Amer-
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        ican. Ethnologists had a distinct reason for wanting to hear the stories: they were after linguistic or anthropo-logical data that would supplement their own field observations, and they believed that the personal stories, even of a single individual, could increase their
10) understanding of the cultures that they had been observing from without. In addition many ethnologists at the turn of the century believed that Native Amer-ican manners and customs were rapidly disappearing,and that it was important to preserve for posterity as
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        much information as could be adequately recorded before the cultures disappeared forever.
* There were, however, arguments against this method as a way of acquiring accurate and complete informa-tion.
            Franz Boas, for example, described autobiogra-
20) phies as being "of limited value, and useful chiefly for the study of the perversion of truth by memory," while Paul Radin contended that investigators rarely spent enough time with the tribes they were observing, and inevitably derived results too tinged by the investi-
25) gator's own emotional tone to be reliable.
* Even more importantly, as these life stories moved from the traditional oral mode to recorded written form, much was inevitably lost. Editors often decided what elements were significant to the field research on a
30) given tribe. Native Americans recognized that the essence of their lives could not be communicated in English and that events that they thought significant were often deemed unimportant by their interviewers.Indeed, the very act of telling their stories could force
35) Native American narrators to distort their cultures, astaboos had to be broken to speak the names of deadrelatives crucial to their family stories.
* Despite all of this, autobiography remains a useful tool for ethnological research: such personal reminis-
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        cences and impressions, incomplete as they may be, arelikely to throw more light on the working of the mindand emotions than any amount of speculation from an ethnologist or ethnological theorist from another culture.

带颜色的那段话，红颜色是这段的分论点，接着蓝色的部分举了两个例子来论证。我的问题是：

第二个PR的例子能明白，但是第一个FB这个例子是什么意思？是根据什么道理来论证红色部分的？很迷惑~~~~~ 能帮忙翻译一下以及讲讲原理吗？多谢！！