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

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