How to understand Li Shangyin's poem "bloom is like snow, brothel flies with wine flags"?

Let bloom be like snow, and the brothel fly the wine flag ":Liu Hua is in full bloom, and snow is flying in the air, flapping the wine flag of the brothel. "

"Gift Willow" Li Shangyin

Willow color on the platform, bright or dark-all the roads, willow branches are dancing like young girls. Many people have heard the praise of Liu Feng to the extreme, and now what they see is just the same graceful.

The charming willow color has reached the bridge, and my heart is behind me when I watch the willow color cut off and extend across the bridge to the long beach. Liu Er is really thoughtful, releasing catkins like snow, floating and flying in the brothel.