Wan Yundong doesn't fly, it represents numbers.

The clear sky and white clouds in Wan Li are the number 990. There are clear skies and white clouds floating in Wan Li, which means: the sky is very clear without a cloud. The weather is fine, and my mood is suddenly enlightened. In other words, the weather is fine and white clouds are dancing, which describes the heart. Clear sky in Wan Li and white clouds in Wan Li: Describe the remote interpretation of the number 9. A clear sky means the sky is high, and the number is 9. White clouds are floating: white clouds are flying like a flock of cotton wool. The number is 0, which means 990, and the three numbers are 990.

As a meteorological term, Huang Yun has several basic definitions, namely yellow cloud gas and yellow sand dust. Dust, the cloud of frontier fortress.