Please take' the sword is grey and the white building is frost' as an example to talk about the role of scenery description.

The reed by the river is green and gray, and the dew in late autumn condenses into frost.

Significance of Millennium: 1 autumn dew. (2) Jude speak out. One of the twenty-four solar terms

Therefore, when it comes to the Millennium, autumn naturally comes to mind.

I remember the original saying: the sword is pale, and the white dew is frost. In The Book of Songs, the scenery in autumn is mainly described. The reed is gray, and the white dew has begun to frost, which probably means this, but it may not be accurate enough.