用英语怎么说蓝天

"Blue sky" is the English equivalent for "蓝天". The phrase "blue sky" refers to the clear, blue color of the sky on a sunny day. It is often used as a symbol of good weather, and also can be used as a metaphor for freedom, hope, and optimism.
Examples:
"The blue sky and warm sun made it the perfect day to go to the beach." (蓝天和温暖的阳光使得这是去海滩的完美一天。)
"After a long period of bad luck, he finally saw the blue sky again." (在一段漫长的运势不佳之后，他终于再次看到了蓝天。)