1. Mandelbrot has a famous saying: "Clouds are not spheres, mountains are not cones, coastlines are not circles, tree bark is not smooth, and lightning does not travel in a straight line."

2. Xu Zhimo: I left as quietly as I came; I waved my hand gently to bid farewell to the clouds in the western sky.

3. "Purple" in "Westward Journey" Xia Xianzi's famous saying "The person I love is an unparalleled hero. One day he will come to pick me up on seven-colored clouds."

4. (Unnamed) Opportunities in life are like clouds that gather and disperse from time to time.

5. (Unnamed) The two of them have no living burdens, have an above-average income, and a love that is so outstanding that it can soar into the clouds. They are very satisfied.