That the borders of our minds are shifting, and that our memories are part of one great memory, the memory of Nature herself.

实际上这是指我们的想象力],我们心灵的边界一直变化，我们的记忆是一个伟大的，自然的记忆的一部分。

耶鲁公开课 - 现代诗歌课程节选

There is surrounding farmland going as far,typically, as there is either a natural or an artificial frontier.

周围环绕着农田,这些农田一般会延伸至一个自然边界,或者一个人工边界为止

耶鲁公开课 - 古希腊历史简介课程节选