Jane Goodall has said that it is often easy to feel upset about the destruction of the natural world.

VOA: special.2009.11.18

Yeats is talking about an event that has brought forth destruction, destruction of the world before the Easter Uprising.

叶芝描绘了这样一个事件,它带来了毁灭，对复活节前世界的毁灭。

耶鲁公开课 - 现代诗歌课程节选