The problem is recurringly in society that it's just horrible designs.

这个问题在社会中反复地出现,那就是可怕的设计了。

哈佛公开课 - 计算机科学课程节选

It's true, these questions have been debated for a very long time but the very fact that they have recurred and persisted may suggest that though they're impossible in one sense, they're unavoidable in another.

诚然，这些问题争论已久,但正因为这些问题反复出现,也许表明，虽然在某种意义上它们无法解决，但另一种意义上，却又无可避免。

耶鲁公开课 - 公正课程节选

Milton was always wrestling with the problem of vocation in all of its meanings, and the problem of what a calling actually is and how one actually knows one has a calling is a problem that pulsates somewhere beneath most of the lines of poetry that Milton writes.

弥尔顿经常纠结于这两个,含义，以及到底什么是神的招唤,还有人们是怎么知道他被召唤了,这些问题反复出现在,弥尔顿的诗句中。

耶鲁公开课 - 弥尔顿课程节选