"Long white ribbons" can be used to describe water flows, such as rivers or waterfalls.
 For example, Li Bai's "Watching Lushan Waterfall": "The incense burner generates purple smoke in the sunshine, and the waterfall hangs in the front of the river from a distance." This poem means that the incense burner peak generates purple haze under the sunlight, and from a distance, the waterfall hangs in front of the mountain like white silk.
 Silk ribbon: pronounced ch ó u d à i, refers to silk cloth ribbon.
 "Ribbon" sentence:
 1. Music is a smooth and elegant ribbon, which makes people relaxed and happy.
 2. Bai Causeway and Su Causeway are like two green ribbons.
 3. The White Causeway in the east of Gushan Mountain and the Su Causeway in the southwest are like two green ribbons floating gently on the clear water.
 4. Looking into the distance, I could see the clear Yangtze River like a white silk ribbon leading to the sky.
 5. Ah, beautiful stream, you are like a silver glittering ribbon, which has set a beautiful lace for the village.