So that can be unsettling when we think of this as happening at a certain contemporaneous moment in the history of thought.

如果把这个问题放在思想史的特定时期来想,它可能是难以解决的。

耶鲁公开课 - 文学理论导论课程节选

This outburst allows Milton to solve what may have seemed up to this point an insoluble conflict: the insoluble conflict between the two meanings of the word vocation that we've been exploring.

这种感情的迸发使得弥尔顿能够解决,一些难以解决的争端：,这种处在天命和才能两个释义之间的,进退两难的争端。

耶鲁公开课 - 弥尔顿课程节选

And that makes it for me a very exciting time to study this because the problems aren't solved in the way that bridge building is largely a solved problem now.

对于我而言,这是一个非常激动人心的时代,因为一百年前桥梁建设中难以解决的问题,在今天都得到了解决

耶鲁公开课 - 生物医学工程探索课程节选

One reason it's been harder to identify stem cells is that they're so rare; the other reason is that it's hard to identify the characteristics of them and it's taken many years to work this out.

干细胞难以识别的原因之一是,这些细胞很少,另一个原因就是,干细胞的特征性蛋白难以识别,我们花了好多年去解决这个问题

耶鲁公开课 - 生物医学工程探索课程节选