What is the word rain in the third Tang poem?

It rained black in the river, and the waves and Whitestorm began to rise. see sb. off

Cao Qinghu, Wan Li, and Huang Meiyu. Bai Juyi's Langtaosha

Poor rain stops the east wind, and thousands of trees hang down separately. Yang Liuzhi of Bai Juyi

Three cold autumn nights, a comfortable old man. After lights out, sleep in the beautiful rain. Bai Juyi's Sleeping in Autumn Rain

These hopes can help you.