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托福official44听力lecture1 The Use Of The Camera Obscura原文解析+翻译音频

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1.What can be inferred from paragraph 1 about Giovanni Battista Della Porta's contribution to the camera obscura?
 
He translated a Chinese description of the use of the camera obscura and made the technique available to artists.
His convex lens made the projected image easier to trace.
His version of the camera obscura allowed for the later addition of a mirror.
His improvements relied heavily on design changes proposed earlier by Leonardo da Vinci.
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