V to learn (something previously known) again 再学习(以前就知道的知识)
The irony is that the lesson had to be relearned a century later.
具有讽刺意味的是，一个世纪后这个教训必须重新学习。
The language just needs to be reactivated and aspects of it relearned.
语言只是需要被再次激活便会像我们重新学习到的一样。
Now that this truth has been un-learned, there is the real fear and strong expectation that it cannot be relearned.
既然这个事实一直没有被了解，也就有着真实的恐惧和强大的预期：它也不会被再次了解。
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