It wasn't until the 20th century, so almost 200 years later, that we learned how to do this.
在詹纳研制出天花疫苗二百多年后,直到二十世纪,我们才知道如何做到这一点
That is, until the great archaeological discoveries of the nineteenth and twentieth centuries, which unearthed for us the great civilizations of the Ancient Near East, of which I have drawn a remarkably life-like map ] here on the board: Mediterranean, I always start with the Mediterranean Ocean, the Nile River, the Tigris and the Euphrates.
直到十九至二十世纪,一些重大的考古发现,才让我们了解到,远古近东的文明,我已经在黑板上画了一幅,栩栩如生的地图了:,地中海,我总是从地中海讲起,尼罗河,底格里斯河,还有幼发拉底河。
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