translation.en: So we've been evolving to talk in a way in which there is no record. In fact, even the next big change to writing was only 500 years ago now, with the printing press, which is very recent in our past, and literacy rates remained incredibly low right up until World War II, so even the people of the last two millennia, most of the words they ever said -- poof! -- disappeared.
translation.zh: 所以我们说话的方式一直在演变， 但是却没有任何记录。事实上，尽管给书写带来巨大变化 距今也已有是500年， 然而随着印刷媒体的出现， 直到第二次世界大战，人们的识字率仍然非常低， 因此，即使是过去2000年的人们， 他们说过的大多数话语 ——呼！消失了。