This sentence came from the ancient Chinese literary classic,"Dream of the Red Chamber". The original text was "There is a cloud made of rain in the wind". The meaning of this sentence was that a cloud appeared in the sky in stormy weather. It looked as beautiful as a flower, but it was called a "cloud made of rain" because of its performance and effect in the wind and rain. This sentence conveyed an important thought, that is, the existence and change of things have a certain reason and law, just like clouds are called "clouds made of rain", there must be some deep reason and connection behind it. In addition, this sentence also hinted at the power and terror of the wind and rain. In the face of powerful wind and heavy rain, anything could be destroyed and changed.