1. Source: "Song of Everlasting Sorrow" by Bai Juyi of the Tang Dynasty: The jade face is lonely and full of tears, and a pear blossom brings rain in spring.
2. Appreciation is as follows: These two sentences describe Yang Guifei's painful mood through visual images. Her lonely face and tears are all the inner pain shown on her face. But this sentence alone is not clear enough, so I added a sentence below: "A pear blossom brings spring rain." Yang Guifei is a famous beauty. Li Bai once compared her to a gorgeous peony in "Qingping Diao"; now that she is in a very painful situation, Bai Juyi compared her to a pear blossom with rain.
3. It comes from a long narrative poem "Song of Everlasting Sorrow" by Bai Juyi, a poet of the Tang Dynasty.