They show up a century or more typically after we know that there is a polis there, and the agora comes about in a gradual way.

大多都是在我们知道,这里有座城邦之后的一个世纪左右才建立起来,而且集市的发展是循序渐进的

耶鲁公开课 - 古希腊历史简介课程节选

They will start out simple and, as usual, they will get progressively more difficult.

我们从简单的开始,我们照旧循序渐进慢慢加大难度

耶鲁公开课 - 基础物理课程节选

Things just happened; they just grew up.

一切都是循序渐进,逐渐发展的

耶鲁公开课 - 古希腊历史简介课程节选