考研英语是一门需要长时间积累的学科，对于备战2015考研的学子们来说，同学们应该主攻单词和语法，坚持每天1-2篇的英语阅读以此来培养语感。

　　We are obliged to them because some of these languages have since vanished，as the people who spoke them died out or became assimilated and lost their native languages.

　　主干识别：We are obliged to them

　　其他成分：because some of these languages have since vanished，状语从句
　　as the people who spoke them died out or became assimilated and lost their nativelanguages.状语从句中的原因状语从句

　　【翻译点拨】：词汇的处理
　　1)be obliged to感激，感谢某人
　　极少有人能译对这个词组，多数人根据oblige的常用意思译为“被 迫”，“有义务”，都不符原文。一词多义很重要!
　　2)have since vanished从那以后就消失了，不复存在了;此处的since 表示 “从此以后”之意;
　　3)die out 消失
　　4)native languages母语

　　成分的处理：
　　some of these languages have since vanished
　　从此以后，这些语言中的一部分消失了
　　the people who spoke them died out or became assimilated and lost their native languages
　　讲这些语言的人要么灭绝了，要么被同化了，因而丧失了自己的语言
　　再用相应的关联词将句子连接起来。

　　【参考译文】：我们之所以感激他们，是因为从此以后，这些语言中的一部分消失了， 因为讲这些语言的人要么灭绝了，要么被同化了，因而丧失了自己的语言。