Spring rain is as expensive as oil, what are the two words after the summer melon and fruit show?

Pronunciation chūn yǔ rú yóu u

Interpretation Spring rain is as expensive as oil. Describe the precious spring rain.

Source Songshi Daoyuan "Jingde Dengchuan Record" Volume 1: "Spring rain is as smooth as oil." Jin's "Spring Rain": "Spring rain is as expensive as oil, and it flows all over the street. Learn from it by sliding and laugh at a herd of cows."

The spring drought in North China is more serious. The spring rain accounts for 10- 15% of the annual precipitation, and in some places it is less than 10%. In spring, there are two dry seasons, autumn and winter. In addition, the temperature rises rapidly in spring, windy days and strong evaporation are often prone to persistent drought. At the same time, it is the time when the overwintering crops turn green to milk maturity, which requires a lot of water, as well as corn and cotton. It also needs plenty of water, so the spring drought is more prominent. If there is rain at this time, it will naturally be particularly precious, so there is a saying that "spring rain is as expensive as oil". The reason is that summer fashion stays in Lingnan area at this time, and the rainy season has not yet arrived.

In the northeast and south, this statement is not very applicable. First, there are more opportunities for rain in the south in spring. Second, although there are few spring rains in Northeast China, and two-thirds of the precipitation is concentrated in June-August, the winter in Northeast China is long, with thick snow on the ground, 40-50 cm thick in mountainous areas and 20 cm thick in plains. In winter, the temperature is low and the evaporation is small. Snow is like a reservoir, which accumulates most of the winter precipitation. The snow melted in the second spring, just as spring sowing began, and snow water became a stable water source, and there was no spring drought in Northeast China.

Spring rain is as expensive as oil, flowing all over the street, playing school and laughing at a herd of cows.