We're talking about a culture when we're talking about the Greeks, which is most strikingly signified by the language that is spoken.

当我们谈论希腊人时我们是谈论希腊文化,是严格以所使用的语言为主要标志的

耶鲁公开课 - 古希腊历史简介课程节选

If you would like to flag them as private, because you just don't want your classmates to see what you're asking, you can certainly do that.

如果你想要把它们标志为私有的，不想让你的同学们,看到你问的问题，你当然也可以这样做。

哈佛公开课 - 计算机科学课程节选