4 Old HSK word(s): 
☊空中 ** B ☊天上 ** C ☊半边天 ** D ☊上空 ** D
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
上 top / superior, highest / go up, send up
空 empty, hollow, bare, deserted
Hsk Characters:
HSK -Characters and beyond:
| Gb | Big5 | Eng | Rad | Mega | Triple | Multilingual |
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Korean:
0 NHSK word(s):
2 KOREAN6000 word(s):
A 하늘 [haneul] The sky
C 공중 [gongjung] The air or the sky
KOREAN 2500 New HSK words):
KOREAN Sentence(s):
