They have a material that supplies electrons and a power source that lifts the energy level of those electrons.

VOA: special.2010.09.01

There is in Frost no God, no transcendental source of guidance or consolation, nothing out there in the world but the material conditions of our circumstances.

在弗罗斯特的诗里，没有上帝，没有卓越的指引和安慰，这个世界里什么都没有,除了我们生活环境的物质条件。

耶鲁公开课 - 现代诗歌课程节选