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關於絨之常識 - common knowledge on corduroy

Column title: 常識 - Common Knowledge
Subject matters: 新知 - new knowledge,
Language level: Baihua

Keywords: general knowledge,

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Article
牙齒之保護 - teeth care

Column title: 常識 - Common Knowledge
Subject matters: 新知 - new knowledge,
Language level: Baihua

Keywords: health, general knowledge,

Persons:
蘋繁 Ping Fan (Author)

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