firmament

名词 firmament:

1. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
   同义词：celestial sphere, sphere, empyrean, heavens, vault of heaven, welkin

1. He rose his head and stared at the firmament.
   他抬起头，凝望着天空。

fir.ma.ment

n.（名词）
The vault or expanse of the heavens; the sky.
苍穹；天空

来源：
Middle English
中古英语
from Old French
源自 古法语
from Late Latin firm3mentum
源自 后期拉丁语 firm3mentum
from Latin [support]
源自 拉丁语 [支撑]
from firm3re [to strengthen] * see firm 2
源自 firm3re [加强] *参见 firm2

【引伸】
fir.mament.al