北城柳絮风似曾相识南巷杨花雨相濡以沫
[bĕi chéng liŭ xù fēng sì céng xiāng shī nán xiàng yáng huā yŭ xiāng rú yĭ mò]
The phrase combines poetic descriptions about memories of past encounters in the city north of the willow down flying with the wind while mentioning mutual reliance amid scenes of Southern alley rains, indicating reminiscing and nostalgic sentiments.