Literally,
Suyun rains, which means it rains at night. It is greasy as dust to describe drizzle, which means it doesn't rain much.
When roses are all wet, it means that wild roses are wet by rain, and wild roses are common flowers in spring, and wet wild roses are more beautiful.
These two poems have the same effect as Liu Feng's. Wet clothes, wet apricot flowers and rain, and cold on the face. They all describe the beautiful spring rain and beautiful spring.