As in "Mowing," Frost is writing about solitude, an essential loneliness.

写到“修剪草坪“，弗罗斯特是在写孤独，一种绝对的孤独。

耶鲁公开课 - 现代诗歌课程节选

Maybe the claim we all die alone is a psychological claim, that the psychological state we are in when we die is similar to loneliness.

也许这是一种心理学上的说法，认为我们死时，感觉很孤独。

耶鲁公开课 - 死亡课程节选

And he says on page 884: A poet writes always of his personal life, in his finest work out of its tragedies, whatever it be, ; remorse, lost love or mere loneliness; he never speaks directly as to someone at the breakfast table there is always a phantasmagoria.

84页他说道：,诗人总写自己的生活，最好的作品总是悲剧，不管是后悔，失恋或孤独;,这是他不会在餐桌上讲的,总是有这样一种幻境。

耶鲁公开课 - 现代诗歌课程节选