What is the picture of "entering Wu on a cold rainy night"?

The picture described in "Cold Rain at Night": One night in autumn and winter, a heavy rain hit, cold and wet.

"Entering Wu on a cold rainy night" means: the river is sprinkled on a cold rainy night.

The author uses boundless river rain and lonely Chushan to contrast the loneliness when seeing off.

This poem is from Furong Inn and Xin Qiji written by Wang Changling, a poet in the Tang Dynasty.

Farewell Xin Jian at the Lotus Pavilion

Author: Changling Wang

Misty rain enveloped Wu's day overnight; Send you in the morning, lonely and sad in Chushan!

Friends, if my friends in Luoyang invite me; Just say I'm still Bing Xin Okho, and stick to my faith!