What does the song mean?

This song is the theme song of a 1983 Taiwanese movie called "The Wrong Car", which is about a mute rag collector who raises an abandoned girl. *The lyrics of the song mean: "Do you have any bottles of wine for sale?". This mute man pedaled a tricycle and played the song "Wine for Sale" with a mouthpiece, and when people heard the sound of the mouthpiece, they brought him bottles of wine to sell. It's a very touching movie that will bring tears to your eyes. The original singer of the song is Su Rui.