What do you mean when the rain is dark?

Now is youth, we should enjoy poetry and wine while we are young, live a good life, and don't let time pass in vain. "Misty rain is a thousand miles away" describes the scenery after the rain, which means that after the rain, the smoke is filled with smoke, and thousands of families are hidden in the rain and fog, and the scenery is hazy, while "Poetry and wine ride the years" warns people to cherish time, grasp the present, enjoy poetry and wine and a beautiful life, and don't let time pass in vain. It is a poem written by Du Mu, a poet in the Tang Dynasty, to bid farewell to ancient grass.