Milton's own faculty of memory - this is the idea that I'm going to be floating here - seems to provide something like, or pose a stumbling block or an obstacle for, his attempt to write an original, divinely inspired poem.

在这里我想说,弥尔顿自己的记忆系统,似乎想提供某种东西，或者想在他写出一部原创的，伟大的诗作的尝试上设置一个障碍。

耶鲁公开课 - 弥尔顿课程节选

What do you think is the biggest obstacle when people from other countries share each other's culture?

你认为来自不同国家的人们在彼此分享自己的文化时，最大的障碍是什么？

关于全球化 - SpeakingMax英语口语达人

You have an obstacle.

和屏障。

麻省理工公开课 - 固态化学导论课程节选