Why is the "phoenix tree" in ancient poetry often accompanied by loneliness and sadness?

Wu Tong is the king of trees. It is said that it is a spiritual tree. It can know when to build it.

On this late autumn morning, I was surprised to see the phoenix tree flowers blooming again. I have always liked the phoenix tree, like its faint flowers, faint fragrance, elegant but unobtrusive, brilliant but warm. I prefer the phoenix tree flowers in the rain. The drizzle falls gently on the phoenix tree flowers, and the tender phoenix tree flowers fall gently with the gentle wind of the drizzle. It is beautiful, although it is a kind of sadness, but I like it very much. My friends all say that I am too sentimental and always touch the scene. No, I'm not that hard. In the rainy season, my heart flies with the wind! Rain hits the phoenix tree and flowers fly, and the wind blows the willow heart!

This phoenix tree flower that blooms in late autumn gives people a fresh and cordial feeling. On the tall and dense buttonwood, there are several small ivory speakers, which exude a faint fragrance, sporadic but eye-catching, subtle but memorable. In this sad autumn, flowers and leaves fall, which inevitably makes people sad. In addition, there are some pains that we can't say. This autumn is really hard and makes people cry. In the dead of night, fragile feelings will play a role, making the left side ache, making breathing painful, tearing the once scars and bleeding until it is unable to go to pain, fatigue and numbness. I don't know when it will be like a dream. . .