What does it mean that Yun Teng turned the rain and dew into frost and gave birth to Lishui, leaving Kungang? I don't understand.

It means: when it is cold, clouds rise to form rain, and when it is cold at night, dew condenses into frost. Gold is produced in Jinsha River and jade is produced in Kunlun Mountain.

This sentence comes from the Southern and Northern Dynasties? Zhou Xingsi's thousand-character writing.

Expand the formation of natural phenomena such as clouds, rain, frost and dew in data. The ancients believed that "the earth's atmosphere rises clouds, and the weather rains."

Frost and dew are homogeneous things, but dew is liquid and frost is solid. Our earth absorbs heat after the sun comes out during the day and dissipates heat after sunset at night. The earth's atmosphere is hot. When scattering upwards, due to the gradual decrease of surface temperature, water vapor turns into dew when it is cold. When the temperature drops further at night, it becomes frost, especially in the Millennium and the first frost solar terms, it becomes frost completely.

However, modern science and technology believe that the rain in Yun Teng is caused by changes in the shape of objects caused by temperature.