我们之所以感激他们(两位先驱)是因为在此之后，这些(土著)语言中有些已经不复存在了，这是由于说这些语言的部族或是消亡了，或是被同化而丧失了自己的本族语言。
We are obliged to them because some of these languages have since vanished， as the peoples who spoke them died out or became assimilated and lost their native languages.
有些语言现在已经消亡了。
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