The problems that Frost's poetry poses for us as readers are not problems of reference. They can't be solved by footnotes.

他的诗歌给我们的困难,不是参考的问题，它们不能就用脚注解决。

耶鲁公开课 - 现代诗歌课程节选

The problems that Frost poses are problems of interpretation, - problems that provoke you to ask not, "what does he mean exactly?

弗罗斯特给我们的困难是翻译，是使人不发问这样的问题，“他到底要说什么“

耶鲁公开课 - 现代诗歌课程节选