Which idiom is used to describe "the sky is particularly blue and bright without a trace of white clouds"?

Blue sky: a light blue sky. The blue sky is as clear as washing. Describe sunny weather.

Source: Song Ganyuan's "Water Tune Song Tou" words: "Wan Li's blue sky is like washing, it is very bright in the cold, and the curtains are rolling in jade waves." At that time, a flock of geese were falling from the sky in a herringbone shape. ★ Shen Congwen's Long River Autumn (Quiet in Motion)

Step 2 block the sun

Cover the sky and the sun. The description covers a wide range. -Idioms about the sky

Source: Wei Li Daoyuan's Notes on Water Classics and Rivers: "The Three Gorges in 700 Li, with two cliffs connected with mountains, have no gaps, and the mountains overlap, covering the sky. Since midnight, there is no sunrise. " Evil and unpredictable. ★ The owner of the collection of green and smallpox, "Yuzhiji"

3, inch by inch

Refers to a small piece of land and sky.

Source: Tang Du Fu's "Car Wash Horse": "Every inch of land is tribute, and strange heresies come and go."

Wan Li has no clouds to describe the sunny weather without any pollution, which comes from the second fold of the third volume of The West Chamber. "Wan Li is cloudless, sky blue and tired."

Clear sky Wan Li [clear sky Wan Li] [idiom explanation] Clear sky: a clear sky. Describe the sky as clear and cloudless.

A blue as Yi Xi is blue as Xi: It usually refers to the color of the sky, so blue that there is no noise, that is, it describes the color of Wan Li when it is clear. Grassland by Lao She (Shu Qingchun);