the vast firmament
starry firmament
blue firmament
the celestial firmament
A: Look at the beauty of the night firmament!
A：看那夜晚苍穹的美丽！
B: It is truly breathtaking to see so many stars.
B：看到这么多星星，真是令人叹为观止。
1) 天空，苍穹
2) 天堂，神圣的领域
3) 文学中的宏大空间
1. 天空；苍穹
noun
1. The heavens or the sky, especially when regarded as a vast or divine expanse.
Synonym: sky, heavens, empyrean