1 Old HSK word(s): 
☊空洞 ** D
防空洞* *
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
防 defend / prevent / embankment
空 empty, hollow, bare, deserted
洞 cave, grotto / ravine / hole
Hsk Characters:
HSK -Characters and beyond:
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Korean:
1 NHSK word(s): 空洞* 6 kong1 dong4cavity/ empty/ vacuous
KOREAN6000 word(s):
0 KOREAN 2500 New HSK words):
0 KOREAN Sentence(s):
