To write a sentence, just give an example and define it.

1. For example, clouds are like signs of weather: what kind of clouds are hanging in the sky, what kind of weather will appear.

2. Appearance: (1) Cirrus clouds are constantly floating.

(2) If the cumulus cloud rises rapidly, it will form a tall Yunshan, and the peaks will compete with each other and go straight to the zenith.

3. Explanation: The lightest and tallest cloud is called cirrus.

4. Classification: We can also infer the weather according to the brilliance on the clouds, and divide the brilliance into four types: halo, glow, rainbow and haze.

5. contrast: from small to large in the middle, the weather will tend to be fine. From big to small in the central part, the weather may turn rainy.

6. Quotations: Therefore, there is a proverb "Do nothing at sunrise, and travel a thousand miles at sunset".

7. Definition: "It means that when cirrostratus appears, the weather will get worse with dizziness." , 4,