a light blue sky的用法和样例：
- As autumn always greened the south China , but it comes slowly and the air is often moist and that the sky .looks a light blue ,also it is usually very rainy but lack of wind .
- She wears a light blue dress and looks extremely attractive.
- Excuse me,can I have a light blue one in the same style?
- A light blue would be a nice colour for the curtains.