Article
關於留聲機的常識 - common knowledge of Gramophone

Column title: 常識 - Common Knowledge
Subject matters: 文章 - essay,
Language level: Mixed

Keywords: general knowledge,

Notes:
常識

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Article
複寫紙復原法 - How to Restore Carbon Paper

Column title: 常識 - Common Knowledge
Subject matters: 文章 - essay,
Language level: Mixed

Keywords: general knowledge,

Notes:
常識

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