本族语言

We are obliged to them because some of theselanguages have since vanished, as the peoples whospoke them died out or became assimilated andlost their native languages.

译文：我们很感激他们，因为在此之后，由于说这些语言的部族或是灭绝，或是被同化并丧失了自己的本族语言，这些语言中有一些已经消失了。

点睛：本句的主干为we are obliged to them because引导的原因状语从句，该原因状语从句中还包含由as引导的另一个原因状语从句。who引导的是以peoples为先行词的定语从句。短语be obliged( to sb.) for sth. /doing sth.意为“受恩惠而感激(某人)”。die out此处意为“灭绝，逐渐消失”。

考点归纳：与动词die相关的常见短语还有：

*die away慢慢变弱，渐渐消失

The strange noise died away.

那奇怪的噪音慢慢消失了。

*die down减弱，平息

Don’t worry; the gossip will soon die down.

别担心，流言不久就会平息的。

*die off相继死去

The plants in the garden died off.

花园里的植物相继死去。