There were certain localized slave societies in East Africa, out of Zanzibar by the eighteenth and nineteenth century.

8至19世纪的东非除了桑吉巴之外,都存在小范围的奴隶社会

耶鲁公开课 - 美国内战与重建课程节选

I might point out that the way the Greeks did their immigration into Asia Minor actually had a pattern so that you can go from north to south and you will find some consistency. Here's what I mean.

我该说明一点,古希腊人移居至小亚细亚,实际上是有一特定形式,因此从北部往南部,你们能发现某些一致性,举个例子来说

耶鲁公开课 - 古希腊历史简介课程节选