碧空如洗 Azure sky as clear as after a wash
Explanation
碧空：浅蓝色的天空。蓝色的天空明净得像洗过一样。形容天气晴朗。
Azure sky: a light blue sky. The blue sky is as clear as if it had been washed. Describes clear weather.
Origin Story
小明放学回家，一出门就看到天空蓝得像一块巨大的蓝宝石，白云像棉花糖一样漂浮在上面。他深深地吸了一口气，感觉空气清新，心情也格外舒畅。他心想：今天真是个好日子，碧空如洗，万里无云，正是郊游的好时机！于是，小明决定去公园散步，享受这美好的天气。
When Timmy went home from school, he saw that the sky was as blue as a giant sapphire, and the white clouds were floating like marshmallows. He took a deep breath and felt how fresh the air was, and his mood was particularly cheerful. He thought: “Today is really a good day, the sky is azure blue, cloudless, that's a good opportunity for a trip!” So Timmy decided to take a walk in the park and enjoy the beautiful weather.
Usage
形容天气晴朗，天空清澈。
Describes the clear weather, the clear sky.
Examples
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今天碧空如洗，真是万里无云的好天气！
jin tian bi kong ru xi, zhen shi wan li wu yun de hao tianqi!
The sky is as clear as after a wash, it's really a beautiful day without a cloud!
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秋高气爽，碧空如洗，让人心旷神怡。
qiu gao qi shuang, bi kong ru xi, rang ren xin kuang shen yi
The autumn is high and refreshing, the sky is as clear as after a wash, which makes people feel refreshed.