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A magnifying glass.

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magnifying glass (複數 magnifying glasses)

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    • 2013 9-10月刊, Henry Petroski, “The Evolution of Eyeglasses”, 出自 American Scientist:
      The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.
      (請為本引文添加中文翻譯

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