1. 天空：welfarism 社会福利 | welkin 天空 | well and truly 准确地
2. 天空, 苍穹 (名)：welfare work 福利事业; 福利工作 | welkin 天空, 苍穹 (名) | well 涌出 (动)
noun
1. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
Synonym: celestial sphere sphere empyrean firmament heavens vault of heaven