万里无云

Explanation: Zhanzhan blue sky, cloudless. Describe the weather was fine. 　　Source: Yuan Wang Shih-fu, "The West Chamber" the third off the second: "azure cloudless, empty Laojuan off body and mind." 　　Examples: ~ He six dragons, birds hold thousands of empty forest. Crack arena rock to fuel boiling, but not to point the wind south. ★ Ming Feng Meng, "Yu Shiming words," XXXIII