It is an uncontrollable mystery "on the bestial floor": on the floor, on the bottom, on the ground, where the animals dwell.

这是个不可控制的神话,发生在兽性的地面上：,在地上，最低处，地面上，那儿是动物栖息的地方。

耶鲁公开课 - 现代诗歌课程节选

In effect, in that middle part of the poem, Yeats collapses creation and destruction, suggesting that the same bestial energy flows through both of these acts.

事实上，在此诗中间部分，叶芝于创造与毁灭中徘徊，暗喻，此间也贯穿着兽性的力量。

耶鲁公开课 - 现代诗歌课程节选