Characters

• 空 (空): empty; air; sky; in vain
• 洞 (洞): cave; hole; zero (unambiguous spoken form when spelling out numbers); CL:個|个[ge4]

Resources

• Wiktionary: 空洞
• MDBG: 空洞
• Examples with 空洞 on Tatoeba

Examples

中國的當代青年文化很空洞。

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