Well, I think, as the convention, it would be very difficult to leave the government because nobody else is just living in the state of nature.

我认为，按照惯例来说，想要脱离政府会是十分困难的,因为没有其他人生活在自然状态下。

耶鲁公开课 - 公正课程节选

um, in one language and then go to another language you have to talk on the level of a child.

再转换到另一门陌生的语言将是十分困难的，他的表达可能变得像儿童一样磕磕巴巴。

想学好英语吗？ - SpeakingMax英语口语达人

It's in solution, it's refrigerated, and it's very difficult to transport refrigerated vaccines to all the remote parts of the world where you would like to transport them.

疫苗需要溶解在水中,还要冷藏,而将这些冷藏的疫苗运送到,世界上所有的偏远地区是十分困难的

耶鲁公开课 - 生物医学工程探索课程节选