例137　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.

【结构分析】这句话的主干是we are obliged to them，后面加上原因状语从句because some of these languages have since vanished...，后面套上原因状语从句as the people who spoke them died out or became assimilated and lost their native languages.

【亮点回放】此句话的亮点连环状语从句的使用，because里面套有as，两个超级原因状语从句套在一起，很有气势，层层分析原因，让读者更加信服。

【核心词汇】

obliged to　感激

vanish　消失

died out　灭绝

assimilated　被同化

native languages　本国语言

【参考译文】我们之所以感激他们是因为由于说这种语言的民族灭绝或者被同化了进而丧失他们自己本民族的语言，所以一部分这种语言自从那以后就消失了。