What do you mean by castle peak, clear water, clear sky, blue sky, sun and moon?

Blue sky, blue sky, bright sun and bright moon, mainly means that the weather is very good, the air is fresh, there is no breeze, and the sun and the moon can be seen at night, which is very bright.

The green mountains and green waters are exhausted, and the blue sea, blue sky and bright moon are a couplet, which is a description and expression of environmental quality.