What do you mean, meandering water attracts clouds, flowers fall with the rain, and stones fall?

The winding river flows eastward like an arrow with clouds and smoke, and thousands of flowers drift with the rain and fall on the mountainside one after another. This sentence comes from Wei Yuan's "plank road fu" in Qing Dynasty. It is a poem describing walking on the plank road, expressing the difficulty and danger of walking. It means that the winding river flows eastward like an arrow with clouds and smoke, and thousands of flowers drift with the wind and fall on the hillside with the rain.