These faces in the crowd are ghostly;
Many petals on a wet black branch.
The author Pound (1885-1972) is a famous American poet and critic, and one of the founders of Imagist poetry. He advocates expressing concrete things with vivid, accurate, implicit and concise images, and this poem In a Subway Station is the masterpiece of Imagist poetry.
I remember the teacher said that the original poem had more than 500 lines. Later, he always felt bad, and finally changed it to two sentences and became a peerless classic.
P.S. I also took an elective course in college.