天空没有云英文是 "the sky is clear"，来源于英语中"clear"这个形容词，意思是"没有云的"、"清澈的"。下面是一些英文例句和中文翻译：
The sky is clear and the sun is shining brightly. (天空清澈，阳光灿烂。)
It's a beautiful day today because the sky is clear and there's a gentle breeze. (今天是个美好的一天，因为天空清澈，还有温柔的微风。)
We decided to go for a hike because the sky was clear and the weather was perfect. (我们决定去徒步旅行，因为天气很好，天空没有云。)