The swan is really only a force, and Yeats's concern is rather with the human experience of that force, which is, again, another manifestation of "terrible beauty."

这天鹅只是一种力量，而叶芝所关注的是,人类对此力量的感受，而这又是，一次，惊人之美，的表现“

耶鲁公开课 - 现代诗歌课程节选

And in Strauss in attempting to do this will use the orchestra to depict here in this particular case perhaps the rise of human power, maybe as metaphorically represented by the sun, so here is Strauss depicting the rise of the sun.

施特劳斯试着用管弦乐,以特别的方式表现人类力量的崛起,用太阳隐喻人类的力量,所以在这里施特劳斯表现了,太阳的升起

耶鲁公开课 - 聆听音乐课程节选