sky fog

例句：

1. 1. The sky was a deep shade of blue.
   天空是深蓝色的。
2. 2. He gazed up at the sky and watched the clouds drift by.
   他仰望天空，看着云朵飘过。
3. 3. The sky was clear and bright, with no clouds in sight.
   天空晴朗明亮，没有云彩。