Frost is a kind of materialist, by which I mean he calls attention to the circumstances of imagination, its limits and conditions.

弗罗斯特是个唯物主义者，这样说的原因是他引起了人们对,想象的环境的注意，它的限制和条件。

耶鲁公开课 - 现代诗歌课程节选

Just to keep things clear, I will say that physicalists, materialists, do not believe in souls.

说得更明白一点,我会说物理主义者,唯物主义者,不相信灵魂

耶鲁公开课 - 死亡课程节选