What does the ancient rain shadow mean?

In ancient times, rainy weather meant that the sky was gloomy and cloudy, which indicated that it was going to rain or it was going to get dark.

This word often appears in ancient poems and literary works, and is used to describe the natural landscape and artistic conception or atmosphere. The meaning of rain yin comes from its literal meaning, that is, the rain is gloomy and gloomy. In ancient times, people usually associated gloomy skies with rain, because this weather phenomenon often indicates that it will rain soon. Therefore, the word "continuous rain" has become a proper term to describe the gloomy sky and dense clouds.