Still, there's some very interesting circumstantial evidence for Semites engaged in building projects in the thirteenth century, however and whenever they might have gotten to Egypt.

可是还是有一些非常有趣的详细的证据,因为闪族投入建筑工程是在13世纪时，他们如何，在什么时候进入埃及。

耶鲁公开课 - 旧约导论课程节选

And so he said, if you start off with a male and a female, at the end of one month they have an offspring. Let's assume they have two offspring. At the end of the next month let's assume those offspring have offspring. Again a male and female.

在13世纪的时候想要计算兔子的数量,就是一个月大的兔子,再过一个月就可以进行交配,所以它说如果你一开始有一公一母两只兔子,在一个月末它们就可以生小兔子,让我们假设它们生了两只小兔子。

麻省理工公开课 - 计算机科学及编程导论课程节选

In 13th century India, they knew how to isolate metallic zinc.

在13世纪的印度，我们知道了如何提取金属锌。

麻省理工公开课 - 固态化学导论课程节选