It's from Song Shi Daoyuan's Record of Jingde Chuandeng. Spring rain is as precious as oil. Interpretation: The drizzle in spring is as precious as oil. It is rare to describe spring rain. Ming Jie Jin's "Spring Rain": "Spring Rain is as expensive as oil, and it flows all over the street, slipping and learning, and laughing at a group of cows."
The reason why spring rain is as expensive as oil
1. It is related to the season. Spring is closely followed by autumn and winter. If there is little rainfall in autumn and winter, the soil moisture itself is not good, and it is often easy to form drought in winter and spring.
2. It is related to the weather and climate characteristics in spring. In spring in northwest and north China, the temperature rises rapidly and there are many windy days. Under the sunlight, soil moisture evaporates strongly, resulting in water loss. In addition, in spring, China's warm air force is not very strong, and the warm and humid airflow from the ocean mostly confronts with cold air in South China and Jiangnan, bringing abundant rain there.