How to read the ancient poem of Egret

People are not completely old when they are forty years old, but I have a lot of white hair because of my sadness. But why do the egrets by the river have some white strands on their heads when they are not sad? Woolen cloth?

Original text of "Egret":

My life has not yet completely declined in my forties, and my hair is gray because of sorrow.

Why are there two egrets by the water, with silk hanging from Wuchou's head.

This poem shows the diversity of egret beauty. First, the egret's appearance is described statically, and then the dynamic beauty of the egret, its standing posture, and the way it flies: on the field ridge, on the treetops, in the sky, in the spatial sequence from low to high. The article describes the egret's beauty not only externally, but also internally. Praising it is a prose poem at its core.

The author Bai Juyi, whose courtesy name was Letian, also known as Xiangshan Jushi, and also Mr. Zuiyin, was born in Weinan, Shaanxi today. In his early years, he was enthusiastic about helping the world, emphasizing the political function of poetry, and striving to be popular. He wrote about 60 poems such as "New Yuefu" and "Qin Zhongyin", which indeed achieved the goal of "only songs can cause diseases for the people" and "every sentence must comply with the rules", which is consistent with Du Fu's "Three Officials" and "Three Farewells" are both famous historical poems.