洞 (dòng) means “cave; hole; zero (unambiguous spoken form when spelling out numbers)”. It is an HSK 5 Chinese character in the HSK 3.0 vocabulary.
Measure word: 个
墙上有个洞,得找人修补。
Qiáng shang yǒu ge dòng, děi zhǎo rén xiūbǔ.
There's a hole in the wall, need to find someone to repair it.
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