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空洞 empty
Stroke order
空洞 is written in 17 strokes across 2 characters.

- 空 — 8 strokes
- 洞 — 9 strokes
Senses
- cavity
- empty
- vacuous
Characters in 空洞
- 空 kōng — empty; air; sky
- 洞 dòng — cave; hole; zero (unambiguous spoken form when spelling out numbers)
Character meanings from CC-CEDICT (CC BY-SA 4.0).
Related words
空洞 is pronounced kōngdòng and means “empty”.