"I hope there is no dust in the world, and some people sell wine and flowers" means that the world is peaceful, without war and dust, people can live and work in peace and contentment, just like before, some people sell wine and some people sell flowers, and life is full of poetry and beauty.
This sentence expresses the author's yearning and pursuit for a peaceful and peaceful life, and also reflects his dissatisfaction and anxiety about the war and turmoil in real life.