The whole sentence is: Jiangnan is good and the scenery is old. When spring comes, the sun rises from the river, the flowers on the river are brighter than red, and the green river is greener than the blue grass. Can you not remember Jiangnan? It means how beautiful the scenery in Jiangnan is, and the picturesque scenery has long been familiar. Spring is coming, and the sun rises from the river, making the flowers on the river brighter than the red ones, and the green river is greener than the blue grass. How can one not miss Jiangnan? This poem describes the river scene in the spring morning very vividly, which makes people feel as if they are on the river in the spring morning when reading this poem.